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人気のある三角関数 >

sec(x)-tan(x)=cos(x)

解

sec (x) - tan (x) = cos (x)

解

x = 2 πn, x = π + 2 πn

+1

度

x = 0^{\circ} + 36 0^{\circ} n, x = 18 0^{\circ} + 36 0^{\circ} n

解答ステップ

sec (x) - tan (x) = cos (x)

両辺から

cos (x)

を引く

sec (x) - tan (x) - cos (x) = 0

サイン, コサインで表わす

- cos (x) + sec (x) - tan (x)

基本的な三角関数の公式を使用する:

sec (x) = \frac{1}{cos ( x )}

= - cos (x) + \frac{1}{cos ( x )} - tan (x)

基本的な三角関数の公式を使用する:

tan (x) = \frac{sin ( x )}{cos ( x )}

= - cos (x) + \frac{1}{cos ( x )} - \frac{sin ( x )}{cos ( x )}

簡素化

- cos (x) + \frac{1}{cos ( x )} - \frac{sin ( x )}{cos ( x )} : \frac{- cos ^{2} ( x ) + 1 - sin ( x )}{cos ( x )}

- cos (x) + \frac{1}{cos ( x )} - \frac{sin ( x )}{cos ( x )}

分数を組み合わせる

\frac{1}{cos ( x )} - \frac{sin ( x )}{cos ( x )} : \frac{1 - sin ( x )}{cos ( x )}

規則を適用

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

= \frac{1 - sin ( x )}{cos ( x )}

= - cos (x) + \frac{- sin ( x ) + 1}{cos ( x )}

元を分数に変換する:

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

= - \frac{cos ( x ) cos ( x )}{cos ( x )} + \frac{1 - sin ( x )}{cos ( x )}

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{- cos ( x ) cos ( x ) + 1 - sin ( x )}{cos ( x )}

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

- cos (x) cos (x) + 1 - sin (x)

cos (x) cos (x) = cos^{2} (x)

cos (x) cos (x)

指数の規則を適用する:

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

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

= cos^{1 + 1} (x)

数を足す:

1 + 1 = 2

= cos^{2} (x)

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

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

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

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

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

1 - cos^{2} (x) - sin (x) = 0

三角関数の公式を使用して書き換える

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

ピタゴラスの公式を使用する:

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

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

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

- sin (x) + sin^{2} (x) = 0

置換で解く

- sin (x) + sin^{2} (x) = 0

仮定:

sin (x) = u

- u + u^{2} = 0

- u + u^{2} = 0 : u = 1, u = 0

- u + u^{2} = 0

標準的な形式で書く

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

u^{2} - u = 0

解くとthe二次式

u^{2} - u = 0

二次Equationの公式:

次の場合:

a = 1, b = - 1, c = 0

u_{1, 2} = \frac{- ( - 1 ) \pm ( - 1 ) ^{2} - 4 \cdot 1 \cdot 0}{2 \cdot 1}

u_{1, 2} = \frac{- ( - 1 ) \pm ( - 1 ) ^{2} - 4 \cdot 1 \cdot 0}{2 \cdot 1}

(- 1)^{2} - 4 \cdot 1 \cdot 0 = 1

(- 1)^{2} - 4 \cdot 1 \cdot 0

(- 1)^{2} = 1

(- 1)^{2}

指数の規則を適用する:

n

が偶数であれば

(- a)^{n} = a^{n}

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

= 1^{2}

規則を適用

1^{a} = 1

= 1

4 \cdot 1 \cdot 0 = 0

4 \cdot 1 \cdot 0

規則を適用

0 \cdot a = 0

= 0

= 1 - 0

数を引く:

1 - 0 = 1

= 1

規則を適用

1 = 1

= 1

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

解を分離する

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

u = \frac{- ( - 1 ) + 1}{2 \cdot 1} : 1

\frac{- ( - 1 ) + 1}{2 \cdot 1}

規則を適用

- (- a) = a

= \frac{1 + 1}{2 \cdot 1}

数を足す:

1 + 1 = 2

= \frac{2}{2 \cdot 1}

数を乗じる:

2 \cdot 1 = 2

= \frac{2}{2}

規則を適用

\frac{a}{a} = 1

= 1

u = \frac{- ( - 1 ) - 1}{2 \cdot 1} : 0

\frac{- ( - 1 ) - 1}{2 \cdot 1}

規則を適用

- (- a) = a

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

数を引く:

1 - 1 = 0

= \frac{0}{2 \cdot 1}

数を乗じる:

2 \cdot 1 = 2

= \frac{0}{2}

規則を適用

\frac{0}{a} = 0, a \neq = 0

= 0

二次equationの解:

u = 1, u = 0

代用を戻す

u = sin (x)

sin (x) = 1, sin (x) = 0

sin (x) = 1, sin (x) = 0

sin (x) = 1 : x = \frac{π}{2} + 2 πn

sin (x) = 1

以下の一般解

sin (x) = 1

sin (x)

2 πn

循環を含む周期性テーブル:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

x = \frac{π}{2} + 2 πn

x = \frac{π}{2} + 2 πn

sin (x) = 0 : x = 2 πn, x = π + 2 πn

sin (x) = 0

以下の一般解

sin (x) = 0

sin (x)

2 πn

循環を含む周期性テーブル:

x 0 \frac{π}{6} \frac{π}{4} \frac{π}{3} \frac{π}{2} \frac{2 π}{3} \frac{3 π}{4} \frac{5 π}{6} sin (x) 0 \frac{1}{2} \frac{2}{2} \frac{3}{2} 1 \frac{3}{2} \frac{2}{2} \frac{1}{2} x π \frac{7 π}{6} \frac{5 π}{4} \frac{4 π}{3} \frac{3 π}{2} \frac{5 π}{3} \frac{7 π}{4} \frac{11 π}{6} sin (x) 0 - \frac{1}{2} - \frac{2}{2} - \frac{3}{2} - 1 - \frac{3}{2} - \frac{2}{2} - \frac{1}{2}

x = 0 + 2 πn, x = π + 2 πn

x = 0 + 2 πn, x = π + 2 πn

解く

x = 0 + 2 πn : x = 2 πn

x = 0 + 2 πn

0 + 2 πn = 2 πn

x = 2 πn

x = 2 πn, x = π + 2 πn

すべての解を組み合わせる

x = \frac{π}{2} + 2 πn, x = 2 πn, x = π + 2 πn

equationは以下で未定義のため:

\frac{π}{2} + 2 πn

x = 2 πn, x = π + 2 πn

グラフ

人気の例

-2sin(x)=-sin(x)cos(x)

- 2 sin (x) = - sin (x) cos (x)

-sin^2(θ)+cos^2(θ)=1+sin(θ)

- sin^{2} (θ) + cos^{2} (θ) = 1 + sin (θ)

sin (\frac{x}{2}) = 1

cos(θ)sin(θ)=sin(2θ)

cos (θ) sin (θ) = sin (2 θ)

4sin(x)cos(x)=-3cos(x)

4 sin (x) cos (x) = - 3 cos (x)