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人気のある三角関数 >

証明する ((sec^2(t)))/(sec^2(t)-1)=csc^2(t)

解

証明する

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

解

真

解答ステップ

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

左側を操作する

\frac{sec ^{2} ( t )}{sec ^{2} ( t ) - 1}

サイン, コサインで表わす

\frac{sec ^{2} ( t )}{- 1 + sec ^{2} ( t )}

基本的な三角関数の公式を使用する:

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

= \frac{( \frac{1}{c o s ( t )} ) ^{2}}{- 1 + ( \frac{1}{c o s ( t )} ) ^{2}}

簡素化

\frac{( \frac{1}{c o s ( t )} ) ^{2}}{- 1 + ( \frac{1}{c o s ( t )} ) ^{2}} : \frac{1}{- cos ^{2} ( t ) + 1}

\frac{( \frac{1}{c o s ( t )} ) ^{2}}{- 1 + ( \frac{1}{c o s ( t )} ) ^{2}}

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

(\frac{1}{cos ( t )})^{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} ( t )}

規則を適用

1^{a} = 1

1^{2} = 1

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

= \frac{( \frac{1}{c o s ( t )} ) ^{2}}{- 1 + \frac{1}{c o s ^{2} ( t )}}

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

(\frac{1}{cos ( t )})^{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} ( t )}

規則を適用

1^{a} = 1

1^{2} = 1

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

= \frac{\frac{1}{c o s ^{2} ( t )}}{- 1 + \frac{1}{c o s ^{2} ( t )}}

分数の規則を適用する:

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

= \frac{1}{cos ^{2} ( t ) ( - 1 + \frac{1}{c o s ^{2} ( t )} )}

結合

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

- 1 + \frac{1}{cos ^{2} ( t )}

元を分数に変換する:

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

= - \frac{1 \cdot cos ^{2} ( t )}{cos ^{2} ( t )} + \frac{1}{cos ^{2} ( t )}

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{- 1 \cdot cos ^{2} ( t ) + 1}{cos ^{2} ( t )}

乗算:

1 \cdot cos^{2} (t) = cos^{2} (t)

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

= \frac{1}{\frac{- c o s ^{2} ( t ) + 1}{c o s ^{2} ( t )} cos ^{2} ( t )}

乗じる

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

cos^{2} (t) \frac{- cos ^{2} ( t ) + 1}{cos ^{2} ( t )}

分数を乗じる:

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

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

共通因数を約分する:

cos^{2} (t)

= - - cos^{2} (t) + 1

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

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

= \frac{1}{1 - cos ^{2} ( t )}

三角関数の公式を使用して書き換える

\frac{1}{1 - cos ^{2} ( t )}

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)

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

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

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}{( \frac{1}{c s c ( t )} ) ^{2}}

簡素化

\frac{1}{( \frac{1}{c s c ( t )} ) ^{2}}

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

(\frac{1}{csc ( t )})^{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} ( t )}

規則を適用

1^{a} = 1

1^{2} = 1

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

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

分数の規則を適用する:

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

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

規則を適用

\frac{a}{1} = a

= csc^{2} (t)

csc^{2} (t)

csc^{2} (t)

両辺を同じ形式にできることを証明した

\Rightarrow 真

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