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人気のある三角関数 >

証明する sec^2(a)+csc^2(a)=sec^2(a)csc^2(a)

解

証明する

sec^{2} (a) + csc^{2} (a) = sec^{2} (a) csc^{2} (a)

解

真

解答ステップ

sec^{2} (a) + csc^{2} (a) = sec^{2} (a) csc^{2} (a)

左側を操作する

sec^{2} (a) + csc^{2} (a)

サイン, コサインで表わす

csc^{2} (a) + sec^{2} (a)

基本的な三角関数の公式を使用する:

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

= (\frac{1}{sin ( a )})^{2} + sec^{2} (a)

基本的な三角関数の公式を使用する:

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

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

簡素化

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

(\frac{1}{sin ( a )})^{2} + (\frac{1}{cos ( a )})^{2}

(\frac{1}{sin ( a )})^{2} = \frac{1}{sin ^{2} ( a )}

(\frac{1}{sin ( a )})^{2}

指数の規則を適用する:

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

= \frac{1 ^{2}}{sin ^{2} ( a )}

規則を適用

1^{a} = 1

1^{2} = 1

= \frac{1}{sin ^{2} ( a )}

(\frac{1}{cos ( a )})^{2} = \frac{1}{cos ^{2} ( a )}

(\frac{1}{cos ( a )})^{2}

指数の規則を適用する:

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

= \frac{1 ^{2}}{cos ^{2} ( a )}

規則を適用

1^{a} = 1

1^{2} = 1

= \frac{1}{cos ^{2} ( a )}

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

以下の最小公倍数:

sin^{2} (a), cos^{2} (a) : sin^{2} (a) cos^{2} (a)

sin^{2} (a), cos^{2} (a)

最小公倍数 (LCM)

sin^{2} (a)

または以下のいずれかに現れる因数で構成された式を計算する:

cos^{2} (a)

= sin^{2} (a) cos^{2} (a)

LCMに基づいて分数を調整する

該当する分母を乗じてLCMに変えるために

必要な量で各分子を乗じる

sin^{2} (a) cos^{2} (a)

\frac{1}{sin ^{2} ( a )}

の場合

:

分母と分子に以下を乗じる:

cos^{2} (a)

\frac{1}{sin ^{2} ( a )} = \frac{1 \cdot cos ^{2} ( a )}{sin ^{2} ( a ) cos ^{2} ( a )} = \frac{cos ^{2} ( a )}{sin ^{2} ( a ) cos ^{2} ( a )}

\frac{1}{cos ^{2} ( a )}

の場合

:

分母と分子に以下を乗じる:

sin^{2} (a)

\frac{1}{cos ^{2} ( a )} = \frac{1 \cdot sin ^{2} ( a )}{cos ^{2} ( a ) sin ^{2} ( a )} = \frac{sin ^{2} ( a )}{sin ^{2} ( a ) cos ^{2} ( a )}

= \frac{cos ^{2} ( a )}{sin ^{2} ( a ) cos ^{2} ( a )} + \frac{sin ^{2} ( a )}{sin ^{2} ( a ) cos ^{2} ( a )}

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 ^{2} ( a ) + sin ^{2} ( a )}{sin ^{2} ( a ) cos ^{2} ( a )}

= \frac{cos ^{2} ( a ) + sin ^{2} ( a )}{sin ^{2} ( a ) cos ^{2} ( a )}

= \frac{cos ^{2} ( a ) + sin ^{2} ( a )}{cos ^{2} ( a ) sin ^{2} ( a )}

三角関数の公式を使用して書き換える

\frac{cos ^{2} ( a ) + sin ^{2} ( a )}{cos ^{2} ( a ) sin ^{2} ( a )}

ピタゴラスの公式を使用する:

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

= \frac{1}{cos ^{2} ( a ) sin ^{2} ( a )}

= \frac{1}{cos ^{2} ( a ) sin ^{2} ( a )}

三角関数の公式を使用して書き換える

基本的な三角関数の公式を使用する:

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

\frac{1}{cos ^{2} ( a ) ( \frac{1}{c s c ( a )} ) ^{2}}

基本的な三角関数の公式を使用する:

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

\frac{1}{( \frac{1}{s e c ( a )} ) ^{2} ( \frac{1}{c s c ( a )} ) ^{2}}

簡素化

\frac{1}{( \frac{1}{s e c ( a )} ) ^{2} ( \frac{1}{c s c ( a )} ) ^{2}}

(\frac{1}{sec ( a )})^{2} = \frac{1}{sec ^{2} ( a )}

(\frac{1}{sec ( a )})^{2}

指数の規則を適用する:

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

= \frac{1 ^{2}}{sec ^{2} ( a )}

規則を適用

1^{a} = 1

1^{2} = 1

= \frac{1}{sec ^{2} ( a )}

= \frac{1}{( \frac{1}{c s c ( a )} ) ^{2} \frac{1}{s e c ^{2} ( a )}}

(\frac{1}{csc ( a )})^{2} = \frac{1}{csc ^{2} ( a )}

(\frac{1}{csc ( a )})^{2}

指数の規則を適用する:

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

= \frac{1 ^{2}}{csc ^{2} ( a )}

規則を適用

1^{a} = 1

1^{2} = 1

= \frac{1}{csc ^{2} ( a )}

= \frac{1}{\frac{1}{s e c ^{2} ( a )} \cdot \frac{1}{c s c ^{2} ( a )}}

乗じる

\frac{1}{sec ^{2} ( a )} \cdot \frac{1}{csc ^{2} ( a )} : \frac{1}{sec ^{2} ( a ) csc ^{2} ( a )}

\frac{1}{sec ^{2} ( a )} \cdot \frac{1}{csc ^{2} ( a )}

分数を乗じる:

\frac{a}{b} \cdot \frac{c}{d} = \frac{a \cdot c}{b \cdot d}

= \frac{1 \cdot 1}{sec ^{2} ( a ) csc ^{2} ( a )}

数を乗じる:

1 \cdot 1 = 1

= \frac{1}{sec ^{2} ( a ) csc ^{2} ( a )}

= \frac{1}{\frac{1}{s e c ^{2} ( a ) c s c ^{2} ( a )}}

分数の規則を適用する:

\frac{1}{\frac{b}{c}} = \frac{c}{b}

= \frac{sec ^{2} ( a ) csc ^{2} ( a )}{1}

規則を適用

\frac{a}{1} = a

= sec^{2} (a) csc^{2} (a)

sec^{2} (a) csc^{2} (a)

sec^{2} (a) csc^{2} (a)

両辺を同じ形式にできることを証明した

\Rightarrow 真

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