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人気のある三角関数 >

tan(1/2 x)=3cos(1/2 x)

解

tan (\frac{1}{2} x) = 3 cos (\frac{1}{2} x)

解

x = 2 \cdot 1.01055 \dots + 4 πn, x = 2 π - 2 \cdot 1.01055 \dots + 4 πn

+1

度

x = 115.80111 \dots^{\circ} + 72 0^{\circ} n, x = 244.19888 \dots^{\circ} + 72 0^{\circ} n

解答ステップ

tan (\frac{1}{2} x) = 3 cos (\frac{1}{2} x)

両辺から

3 cos (\frac{1}{2} x)

を引く

tan (\frac{x}{2}) - 3 cos (\frac{x}{2}) = 0

サイン, コサインで表わす

\frac{sin ( \frac{x}{2} )}{cos ( \frac{x}{2} )} - 3 cos (\frac{x}{2}) = 0

簡素化

\frac{sin ( \frac{x}{2} )}{cos ( \frac{x}{2} )} - 3 cos (\frac{x}{2}) : \frac{sin ( \frac{x}{2} ) - 3 cos ^{2} ( \frac{x}{2} )}{cos ( \frac{x}{2} )}

\frac{sin ( \frac{x}{2} )}{cos ( \frac{x}{2} )} - 3 cos (\frac{x}{2})

元を分数に変換する:

3 cos (\frac{x}{2}) = \frac{3 cos ( \frac{x}{2} ) cos ( \frac{x}{2} )}{cos ( \frac{x}{2} )}

= \frac{sin ( \frac{x}{2} )}{cos ( \frac{x}{2} )} - \frac{3 cos ( \frac{x}{2} ) cos ( \frac{x}{2} )}{cos ( \frac{x}{2} )}

分母が等しいので, 分数を組み合わせる:

\frac{a}{c} \pm \frac{b}{c} = \frac{a \pm b}{c}

= \frac{sin ( \frac{x}{2} ) - 3 cos ( \frac{x}{2} ) cos ( \frac{x}{2} )}{cos ( \frac{x}{2} )}

sin (\frac{x}{2}) - 3 cos (\frac{x}{2}) cos (\frac{x}{2}) = sin (\frac{x}{2}) - 3 cos^{2} (\frac{x}{2})

sin (\frac{x}{2}) - 3 cos (\frac{x}{2}) cos (\frac{x}{2})

3 cos (\frac{x}{2}) cos (\frac{x}{2}) = 3 cos^{2} (\frac{x}{2})

3 cos (\frac{x}{2}) cos (\frac{x}{2})

指数の規則を適用する:

a^{b} \cdot a^{c} = a^{b + c}

cos (\frac{x}{2}) cos (\frac{x}{2}) = cos^{1 + 1} (\frac{x}{2})

= 3 cos^{1 + 1} (\frac{x}{2})

数を足す:

1 + 1 = 2

= 3 cos^{2} (\frac{x}{2})

= sin (\frac{x}{2}) - 3 cos^{2} (\frac{x}{2})

= \frac{sin ( \frac{x}{2} ) - 3 cos ^{2} ( \frac{x}{2} )}{cos ( \frac{x}{2} )}

\frac{sin ( \frac{x}{2} ) - 3 cos ^{2} ( \frac{x}{2} )}{cos ( \frac{x}{2} )} = 0

\frac{f ( x )}{g ( x )} = 0 \Rightarrow f (x) = 0

sin (\frac{x}{2}) - 3 cos^{2} (\frac{x}{2}) = 0

両辺に

3 cos^{2} (\frac{x}{2})

を足す

sin (\frac{x}{2}) = 3 cos^{2} (\frac{x}{2})

両辺を2乗する

sin^{2} (\frac{x}{2}) = (3 cos^{2} (\frac{x}{2}))^{2}

両辺から

(3 cos^{2} (\frac{x}{2}))^{2}

を引く

sin^{2} (\frac{x}{2}) - 9 cos^{4} (\frac{x}{2}) = 0

因数

sin^{2} (\frac{x}{2}) - 9 cos^{4} (\frac{x}{2}) : (sin (\frac{x}{2}) + 3 cos^{2} (\frac{x}{2})) (sin (\frac{x}{2}) - 3 cos^{2} (\frac{x}{2}))

sin^{2} (\frac{x}{2}) - 9 cos^{4} (\frac{x}{2})

sin^{2} (\frac{x}{2}) - 9 cos^{4} (\frac{x}{2})

を書き換え

sin^{2} (\frac{x}{2}) - (3 cos^{2} (\frac{x}{2}))^{2}

sin^{2} (\frac{x}{2}) - 9 cos^{4} (\frac{x}{2})

9

を書き換え

3^{2}

= sin^{2} (\frac{x}{2}) - 3^{2} cos^{4} (\frac{x}{2})

指数の規則を適用する:

a^{b c} = (a^{b})^{c}

cos^{4} (\frac{x}{2}) = (cos^{2} (\frac{x}{2}))^{2}

= sin^{2} (\frac{x}{2}) - 3^{2} (cos^{2} (\frac{x}{2}))^{2}

指数の規則を適用する:

a^{m} b^{m} = (ab)^{m}

3^{2} (cos^{2} (\frac{x}{2}))^{2} = (3 cos^{2} (\frac{x}{2}))^{2}

= sin^{2} (\frac{x}{2}) - (3 cos^{2} (\frac{x}{2}))^{2}

= sin^{2} (\frac{x}{2}) - (3 cos^{2} (\frac{x}{2}))^{2}

2乗の差の公式を適用する:

x^{2} - y^{2} = (x + y) (x - y)

sin^{2} (\frac{x}{2}) - (3 cos^{2} (\frac{x}{2}))^{2} = (sin (\frac{x}{2}) + 3 cos^{2} (\frac{x}{2})) (sin (\frac{x}{2}) - 3 cos^{2} (\frac{x}{2}))

= (sin (\frac{x}{2}) + 3 cos^{2} (\frac{x}{2})) (sin (\frac{x}{2}) - 3 cos^{2} (\frac{x}{2}))

(sin (\frac{x}{2}) + 3 cos^{2} (\frac{x}{2})) (sin (\frac{x}{2}) - 3 cos^{2} (\frac{x}{2})) = 0

各部分を別個に解く

sin (\frac{x}{2}) + 3 cos^{2} (\frac{x}{2}) = 0 or sin (\frac{x}{2}) - 3 cos^{2} (\frac{x}{2}) = 0

sin (\frac{x}{2}) + 3 cos^{2} (\frac{x}{2}) = 0 : x = - 2 arcsin (\frac{37 - 1}{6}) + 4 πn, x = 2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

sin (\frac{x}{2}) + 3 cos^{2} (\frac{x}{2}) = 0

三角関数の公式を使用して書き換える

sin (\frac{x}{2}) + 3 cos^{2} (\frac{x}{2})

ピタゴラスの公式を使用する:

cos^{2} (x) + sin^{2} (x) = 1

cos^{2} (x) = 1 - sin^{2} (x)

= sin (\frac{x}{2}) + 3 (1 - sin^{2} (\frac{x}{2}))

sin (\frac{x}{2}) + (1 - sin^{2} (\frac{x}{2})) \cdot 3 = 0

置換で解く

sin (\frac{x}{2}) + (1 - sin^{2} (\frac{x}{2})) \cdot 3 = 0

仮定:

sin (\frac{x}{2}) = u

u + (1 - u^{2}) \cdot 3 = 0

u + (1 - u^{2}) \cdot 3 = 0 : u = - \frac{- 1 + 37}{6}, u = \frac{1 + 37}{6}

u + (1 - u^{2}) \cdot 3 = 0

拡張

u + (1 - u^{2}) \cdot 3 : u + 3 - 3 u^{2}

u + (1 - u^{2}) \cdot 3

= u + 3 (1 - u^{2})

拡張

3 (1 - u^{2}) : 3 - 3 u^{2}

3 (1 - u^{2})

分配法則を適用する:

a (b - c) = ab - a c

a = 3, b = 1, c = u^{2}

= 3 \cdot 1 - 3 u^{2}

数を乗じる:

3 \cdot 1 = 3

= 3 - 3 u^{2}

= u + 3 - 3 u^{2}

u + 3 - 3 u^{2} = 0

標準的な形式で書く

a x^{2} + b x + c = 0

- 3 u^{2} + u + 3 = 0

解くとthe二次式

- 3 u^{2} + u + 3 = 0

二次Equationの公式:

次の場合:

a = - 3, b = 1, c = 3

u_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 ( - 3 ) \cdot 3}{2 ( - 3 )}

u_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 ( - 3 ) \cdot 3}{2 ( - 3 )}

1^{2} - 4 (- 3) \cdot 3 = 37

1^{2} - 4 (- 3) \cdot 3

規則を適用

1^{a} = 1

1^{2} = 1

= 1 - 4 (- 3) \cdot 3

規則を適用

- (- a) = a

= 1 + 4 \cdot 3 \cdot 3

数を乗じる:

4 \cdot 3 \cdot 3 = 36

= 1 + 36

数を足す:

1 + 36 = 37

= 37

u_{1, 2} = \frac{- 1 \pm 37}{2 ( - 3 )}

解を分離する

u_{1} = \frac{- 1 + 37}{2 ( - 3 )}, u_{2} = \frac{- 1 - 37}{2 ( - 3 )}

u = \frac{- 1 + 37}{2 ( - 3 )} : - \frac{- 1 + 37}{6}

\frac{- 1 + 37}{2 ( - 3 )}

括弧を削除する:

(- a) = - a

= \frac{- 1 + 37}{- 2 \cdot 3}

数を乗じる:

2 \cdot 3 = 6

= \frac{- 1 + 37}{- 6}

分数の規則を適用する:

\frac{a}{- b} = - \frac{a}{b}

= - \frac{- 1 + 37}{6}

u = \frac{- 1 - 37}{2 ( - 3 )} : \frac{1 + 37}{6}

\frac{- 1 - 37}{2 ( - 3 )}

括弧を削除する:

(- a) = - a

= \frac{- 1 - 37}{- 2 \cdot 3}

数を乗じる:

2 \cdot 3 = 6

= \frac{- 1 - 37}{- 6}

分数の規則を適用する:

\frac{- a}{- b} = \frac{a}{b}

- 1 - 37 = - (1 + 37)

= \frac{1 + 37}{6}

二次equationの解:

u = - \frac{- 1 + 37}{6}, u = \frac{1 + 37}{6}

代用を戻す

u = sin (\frac{x}{2})

sin (\frac{x}{2}) = - \frac{- 1 + 37}{6}, sin (\frac{x}{2}) = \frac{1 + 37}{6}

sin (\frac{x}{2}) = - \frac{- 1 + 37}{6}, sin (\frac{x}{2}) = \frac{1 + 37}{6}

sin (\frac{x}{2}) = - \frac{- 1 + 37}{6} : x = - 2 arcsin (\frac{37 - 1}{6}) + 4 πn, x = 2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

sin (\frac{x}{2}) = - \frac{- 1 + 37}{6}

三角関数の逆数プロパティを適用する

sin (\frac{x}{2}) = - \frac{- 1 + 37}{6}

以下の一般解

sin (\frac{x}{2}) = - \frac{- 1 + 37}{6}

sin (x) = - a \Rightarrow x = arcsin (- a) + 2 πn, x = π + arcsin (a) + 2 πn

\frac{x}{2} = arcsin (- \frac{- 1 + 37}{6}) + 2 πn, \frac{x}{2} = π + arcsin (\frac{- 1 + 37}{6}) + 2 πn

\frac{x}{2} = arcsin (- \frac{- 1 + 37}{6}) + 2 πn, \frac{x}{2} = π + arcsin (\frac{- 1 + 37}{6}) + 2 πn

解く

\frac{x}{2} = arcsin (- \frac{- 1 + 37}{6}) + 2 πn : x = - 2 arcsin (\frac{37 - 1}{6}) + 4 πn

\frac{x}{2} = arcsin (- \frac{- 1 + 37}{6}) + 2 πn

簡素化

arcsin (- \frac{- 1 + 37}{6}) + 2 πn : - arcsin (\frac{37 - 1}{6}) + 2 πn

arcsin (- \frac{- 1 + 37}{6}) + 2 πn

次のプロパティを使用する:

arcsin (- x) = - arcsin (x)

arcsin (- \frac{37 - 1}{6}) = - arcsin (\frac{37 - 1}{6})

= - arcsin (\frac{37 - 1}{6}) + 2 πn

\frac{x}{2} = - arcsin (\frac{37 - 1}{6}) + 2 πn

以下で両辺を乗じる:

2

\frac{x}{2} = - arcsin (\frac{37 - 1}{6}) + 2 πn

以下で両辺を乗じる:

2

\frac{2 x}{2} = - 2 arcsin (\frac{37 - 1}{6}) + 2 \cdot 2 πn

簡素化

\frac{2 x}{2} = - 2 arcsin (\frac{37 - 1}{6}) + 2 \cdot 2 πn

簡素化

\frac{2 x}{2} : x

\frac{2 x}{2}

数を割る:

\frac{2}{2} = 1

= x

簡素化

- 2 arcsin (\frac{37 - 1}{6}) + 2 \cdot 2 πn : - 2 arcsin (\frac{37 - 1}{6}) + 4 πn

- 2 arcsin (\frac{37 - 1}{6}) + 2 \cdot 2 πn

数を乗じる:

2 \cdot 2 = 4

= - 2 arcsin (\frac{37 - 1}{6}) + 4 πn

x = - 2 arcsin (\frac{37 - 1}{6}) + 4 πn

x = - 2 arcsin (\frac{37 - 1}{6}) + 4 πn

x = - 2 arcsin (\frac{37 - 1}{6}) + 4 πn

解く

\frac{x}{2} = π + arcsin (\frac{- 1 + 37}{6}) + 2 πn : x = 2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

\frac{x}{2} = π + arcsin (\frac{- 1 + 37}{6}) + 2 πn

以下で両辺を乗じる:

2

\frac{x}{2} = π + arcsin (\frac{- 1 + 37}{6}) + 2 πn

以下で両辺を乗じる:

2

\frac{2 x}{2} = 2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 2 \cdot 2 πn

簡素化

\frac{2 x}{2} = 2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 2 \cdot 2 πn

簡素化

\frac{2 x}{2} : x

\frac{2 x}{2}

数を割る:

\frac{2}{2} = 1

= x

簡素化

2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 2 \cdot 2 πn : 2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 2 \cdot 2 πn

数を乗じる:

2 \cdot 2 = 4

= 2 π + 2 arcsin (\frac{37 - 1}{6}) + 4 πn

x = 2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

x = 2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

x = 2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

x = - 2 arcsin (\frac{37 - 1}{6}) + 4 πn, x = 2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

sin (\frac{x}{2}) = \frac{1 + 37}{6} :

解なし

sin (\frac{x}{2}) = \frac{1 + 37}{6}

- 1 \leq sin (x) \leq 1

解なし

すべての解を組み合わせる

x = - 2 arcsin (\frac{37 - 1}{6}) + 4 πn, x = 2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

sin (\frac{x}{2}) - 3 cos^{2} (\frac{x}{2}) = 0 : x = 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn, x = 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

sin (\frac{x}{2}) - 3 cos^{2} (\frac{x}{2}) = 0

三角関数の公式を使用して書き換える

sin (\frac{x}{2}) - 3 cos^{2} (\frac{x}{2})

ピタゴラスの公式を使用する:

cos^{2} (x) + sin^{2} (x) = 1

cos^{2} (x) = 1 - sin^{2} (x)

= sin (\frac{x}{2}) - 3 (1 - sin^{2} (\frac{x}{2}))

sin (\frac{x}{2}) - (1 - sin^{2} (\frac{x}{2})) \cdot 3 = 0

置換で解く

sin (\frac{x}{2}) - (1 - sin^{2} (\frac{x}{2})) \cdot 3 = 0

仮定:

sin (\frac{x}{2}) = u

u - (1 - u^{2}) \cdot 3 = 0

u - (1 - u^{2}) \cdot 3 = 0 : u = \frac{- 1 + 37}{6}, u = \frac{- 1 - 37}{6}

u - (1 - u^{2}) \cdot 3 = 0

拡張

u - (1 - u^{2}) \cdot 3 : u - 3 + 3 u^{2}

u - (1 - u^{2}) \cdot 3

= u - 3 (1 - u^{2})

拡張

- 3 (1 - u^{2}) : - 3 + 3 u^{2}

- 3 (1 - u^{2})

分配法則を適用する:

a (b - c) = ab - a c

a = - 3, b = 1, c = u^{2}

= - 3 \cdot 1 - (- 3) u^{2}

マイナス・プラスの規則を適用する

- (- a) = a

= - 3 \cdot 1 + 3 u^{2}

数を乗じる:

3 \cdot 1 = 3

= - 3 + 3 u^{2}

= u - 3 + 3 u^{2}

u - 3 + 3 u^{2} = 0

標準的な形式で書く

a x^{2} + b x + c = 0

3 u^{2} + u - 3 = 0

解くとthe二次式

3 u^{2} + u - 3 = 0

二次Equationの公式:

次の場合:

a = 3, b = 1, c = - 3

u_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 \cdot 3 ( - 3 )}{2 \cdot 3}

u_{1, 2} = \frac{- 1 \pm 1 ^{2} - 4 \cdot 3 ( - 3 )}{2 \cdot 3}

1^{2} - 4 \cdot 3 (- 3) = 37

1^{2} - 4 \cdot 3 (- 3)

規則を適用

1^{a} = 1

1^{2} = 1

= 1 - 4 \cdot 3 (- 3)

規則を適用

- (- a) = a

= 1 + 4 \cdot 3 \cdot 3

数を乗じる:

4 \cdot 3 \cdot 3 = 36

= 1 + 36

数を足す:

1 + 36 = 37

= 37

u_{1, 2} = \frac{- 1 \pm 37}{2 \cdot 3}

解を分離する

u_{1} = \frac{- 1 + 37}{2 \cdot 3}, u_{2} = \frac{- 1 - 37}{2 \cdot 3}

u = \frac{- 1 + 37}{2 \cdot 3} : \frac{- 1 + 37}{6}

\frac{- 1 + 37}{2 \cdot 3}

数を乗じる:

2 \cdot 3 = 6

= \frac{- 1 + 37}{6}

u = \frac{- 1 - 37}{2 \cdot 3} : \frac{- 1 - 37}{6}

\frac{- 1 - 37}{2 \cdot 3}

数を乗じる:

2 \cdot 3 = 6

= \frac{- 1 - 37}{6}

二次equationの解:

u = \frac{- 1 + 37}{6}, u = \frac{- 1 - 37}{6}

代用を戻す

u = sin (\frac{x}{2})

sin (\frac{x}{2}) = \frac{- 1 + 37}{6}, sin (\frac{x}{2}) = \frac{- 1 - 37}{6}

sin (\frac{x}{2}) = \frac{- 1 + 37}{6}, sin (\frac{x}{2}) = \frac{- 1 - 37}{6}

sin (\frac{x}{2}) = \frac{- 1 + 37}{6} : x = 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn, x = 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

sin (\frac{x}{2}) = \frac{- 1 + 37}{6}

三角関数の逆数プロパティを適用する

sin (\frac{x}{2}) = \frac{- 1 + 37}{6}

以下の一般解

sin (\frac{x}{2}) = \frac{- 1 + 37}{6}

sin (x) = a \Rightarrow x = arcsin (a) + 2 πn, x = π - arcsin (a) + 2 πn

\frac{x}{2} = arcsin (\frac{- 1 + 37}{6}) + 2 πn, \frac{x}{2} = π - arcsin (\frac{- 1 + 37}{6}) + 2 πn

\frac{x}{2} = arcsin (\frac{- 1 + 37}{6}) + 2 πn, \frac{x}{2} = π - arcsin (\frac{- 1 + 37}{6}) + 2 πn

解く

\frac{x}{2} = arcsin (\frac{- 1 + 37}{6}) + 2 πn : x = 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

\frac{x}{2} = arcsin (\frac{- 1 + 37}{6}) + 2 πn

以下で両辺を乗じる:

2

\frac{x}{2} = arcsin (\frac{- 1 + 37}{6}) + 2 πn

以下で両辺を乗じる:

2

\frac{2 x}{2} = 2 arcsin (\frac{- 1 + 37}{6}) + 2 \cdot 2 πn

簡素化

\frac{2 x}{2} = 2 arcsin (\frac{- 1 + 37}{6}) + 2 \cdot 2 πn

簡素化

\frac{2 x}{2} : x

\frac{2 x}{2}

数を割る:

\frac{2}{2} = 1

= x

簡素化

2 arcsin (\frac{- 1 + 37}{6}) + 2 \cdot 2 πn : 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

2 arcsin (\frac{- 1 + 37}{6}) + 2 \cdot 2 πn

数を乗じる:

2 \cdot 2 = 4

= 2 arcsin (\frac{37 - 1}{6}) + 4 πn

x = 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

x = 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

x = 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

解く

\frac{x}{2} = π - arcsin (\frac{- 1 + 37}{6}) + 2 πn : x = 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

\frac{x}{2} = π - arcsin (\frac{- 1 + 37}{6}) + 2 πn

以下で両辺を乗じる:

2

\frac{x}{2} = π - arcsin (\frac{- 1 + 37}{6}) + 2 πn

以下で両辺を乗じる:

2

\frac{2 x}{2} = 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 2 \cdot 2 πn

簡素化

\frac{2 x}{2} = 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 2 \cdot 2 πn

簡素化

\frac{2 x}{2} : x

\frac{2 x}{2}

数を割る:

\frac{2}{2} = 1

= x

簡素化

2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 2 \cdot 2 πn : 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 2 \cdot 2 πn

数を乗じる:

2 \cdot 2 = 4

= 2 π - 2 arcsin (\frac{37 - 1}{6}) + 4 πn

x = 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

x = 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

x = 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

x = 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn, x = 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

sin (\frac{x}{2}) = \frac{- 1 - 37}{6} :

解なし

sin (\frac{x}{2}) = \frac{- 1 - 37}{6}

- 1 \leq sin (x) \leq 1

解なし

すべての解を組み合わせる

x = 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn, x = 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

すべての解を組み合わせる

x = - 2 arcsin (\frac{37 - 1}{6}) + 4 πn, x = 2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn, x = 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn, x = 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

元のequationに当てはめて解を検算する

tan (\frac{1}{2} x) = 3 cos (\frac{1}{2} x)

に当てはめて解を確認する

equationに一致しないものを削除する。

解答を確認する

- 2 arcsin (\frac{37 - 1}{6}) + 4 πn :

偽

- 2 arcsin (\frac{37 - 1}{6}) + 4 πn

挿入

n = 1

- 2 arcsin (\frac{37 - 1}{6}) + 4 π 1

tan (\frac{1}{2} x) = 3 cos (\frac{1}{2} x)

の挿入向け

x = - 2 arcsin (\frac{37 - 1}{6}) + 4 π 1

tan (\frac{1}{2} (- 2 arcsin (\frac{37 - 1}{6}) + 4 π 1)) = 3 cos (\frac{1}{2} (- 2 arcsin (\frac{37 - 1}{6}) + 4 π 1))

改良

- 1.59417 \dots = 1.59417 \dots

\Rightarrow 偽

解答を確認する

2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn :

偽

2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

挿入

n = 1

2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 π 1

tan (\frac{1}{2} x) = 3 cos (\frac{1}{2} x)

の挿入向け

x = 2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 π 1

tan (\frac{1}{2} (2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 π 1)) = 3 cos (\frac{1}{2} (2 π + 2 arcsin (\frac{- 1 + 37}{6}) + 4 π 1))

改良

1.59417 \dots = - 1.59417 \dots

\Rightarrow 偽

解答を確認する

2 arcsin (\frac{- 1 + 37}{6}) + 4 πn :

真

2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

挿入

n = 1

2 arcsin (\frac{- 1 + 37}{6}) + 4 π 1

tan (\frac{1}{2} x) = 3 cos (\frac{1}{2} x)

の挿入向け

x = 2 arcsin (\frac{- 1 + 37}{6}) + 4 π 1

tan (\frac{1}{2} (2 arcsin (\frac{- 1 + 37}{6}) + 4 π 1)) = 3 cos (\frac{1}{2} (2 arcsin (\frac{- 1 + 37}{6}) + 4 π 1))

改良

1.59417 \dots = 1.59417 \dots

\Rightarrow 真

解答を確認する

2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn :

真

2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

挿入

n = 1

2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 π 1

tan (\frac{1}{2} x) = 3 cos (\frac{1}{2} x)

の挿入向け

x = 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 π 1

tan (\frac{1}{2} (2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 π 1)) = 3 cos (\frac{1}{2} (2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 π 1))

改良

- 1.59417 \dots = - 1.59417 \dots

\Rightarrow 真

x = 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn, x = 2 π - 2 arcsin (\frac{- 1 + 37}{6}) + 4 πn

10進法形式で解を証明する

x = 2 \cdot 1.01055 \dots + 4 πn, x = 2 π - 2 \cdot 1.01055 \dots + 4 πn

グラフ

人気の例

cos(2θ)=-1/2 ,0<= x<= 2pi

cos (2 θ) = - \frac{1}{2}, 0 \leq x \leq 2 π

cos (x) = - \frac{5}{13}

sin^2(x)=6(cos(x)+1)

sin^{2} (x) = 6 (cos (x) + 1)

2cos^2(x)-cos(x)=1,0<= x<= 2pi

2 cos^{2} (x) - cos (x) = 1, 0 \leq x \leq 2 π

7sin^2(θ)-36sin(θ)+5=0

7 sin^{2} (θ) - 36 sin (θ) + 5 = 0