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受欢迎的微积分 >

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

解答

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

解答

tan^{5} (\frac{x}{5}) + \frac{5}{7} tan^{7} (\frac{x}{5}) + C

求解步骤

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

使用换元积分法

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

提出常数:

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

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

使用三角恒等式改写

= 5 \cdot \int (1 + tan^{2} (u)) sec^{2} (u) tan^{4} (u) d u

使用换元积分法

= 5 \cdot \int v^{4} (1 + v^{2}) d v

乘开

v^{4} (1 + v^{2}) : v^{4} + v^{6}

= 5 \cdot \int v^{4} + v^{6} d v

使用积分加法定则:

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

= 5 (\int v^{4} d v + \int v^{6} d v)

\int v^{4} d v = \frac{v ^{5}}{5}

\int v^{6} d v = \frac{v ^{7}}{7}

= 5 (\frac{v ^{5}}{5} + \frac{v ^{7}}{7})

代回

= 5 (\frac{tan ^{5} ( \frac{x}{5} )}{5} + \frac{tan ^{7} ( \frac{x}{5} )}{7})

化简

5 (\frac{tan ^{5} ( \frac{x}{5} )}{5} + \frac{tan ^{7} ( \frac{x}{5} )}{7}) : tan^{5} (\frac{x}{5}) + \frac{5}{7} tan^{7} (\frac{x}{5})

= tan^{5} (\frac{x}{5}) + \frac{5}{7} tan^{7} (\frac{x}{5})

解答补常数

= tan^{5} (\frac{x}{5}) + \frac{5}{7} tan^{7} (\frac{x}{5}) + C

作图

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