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人気のある微分積分 >

integral of 5tan^5(x)sec^4(x)

解

\int 5 tan^{5} (x) sec^{4} (x) d x

解

5 (\frac{tan ^{6} ( x )}{6} + \frac{tan ^{8} ( x )}{8}) + C

解答ステップ

\int 5 tan^{5} (x) sec^{4} (x) d x

定数を除く:

\int a \cdot f (x) d x = a \cdot \int f (x) d x

= 5 \cdot \int tan^{5} (x) sec^{4} (x) d x

三角関数の公式を使用して書き換える

= 5 \cdot \int (1 + tan^{2} (x)) sec^{2} (x) tan^{5} (x) d x

u置換積分法を適用する

= 5 \cdot \int u^{5} (1 + u^{2}) d u

拡張

u^{5} (1 + u^{2}) : u^{5} + u^{7}

= 5 \cdot \int u^{5} + u^{7} d u

総和規則を適用する:

\int f (x) \pm g (x) d x = \int f (x) d x \pm \int g (x) d x

= 5 (\int u^{5} d u + \int u^{7} d u)

\int u^{5} d u = \frac{u ^{6}}{6}

\int u^{7} d u = \frac{u ^{8}}{8}

= 5 (\frac{u ^{6}}{6} + \frac{u ^{8}}{8})

代用を戻す

u = tan (x)

= 5 (\frac{tan ^{6} ( x )}{6} + \frac{tan ^{8} ( x )}{8})

定数を解答に追加する

= 5 (\frac{tan ^{6} ( x )}{6} + \frac{tan ^{8} ( x )}{8}) + C

グラフ

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