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受欢迎的微积分 >

integral of (cot(pix)+tan(pix))^2

解答

\int (cot (π x) + tan (π x))^{2} d x

解答

\frac{1}{π} (- cot (π x) + tan (π x)) + C

求解步骤

\int (cot (π x) + tan (π x))^{2} d x

使用换元积分法

= \int (cot (u) + tan (u))^{2} \frac{1}{π} d u

提出常数:

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

= \frac{1}{π} \cdot \int (cot (u) + tan (u))^{2} d u

使用换元积分法

= \frac{1}{π} \cdot \int \frac{v ^{2} + 1}{v ^{2}} d v

\frac{v ^{2} + 1}{v ^{2}} = \frac{1}{v ^{2}} + 1

= \frac{1}{π} \cdot \int \frac{1}{v ^{2}} + 1 d v

使用指数法则:

\frac{1}{a ^{b}} = a^{- b}

\frac{1}{v ^{2}} = v^{- 2}

= \frac{1}{π} \cdot \int v^{- 2} + 1 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

= \frac{1}{π} (\int v^{- 2} d v + \int 1 d v)

\int v^{- 2} d v = - \frac{1}{v}

\int 1 d v = v

= \frac{1}{π} (- \frac{1}{v} + v)

代回

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

使用基本三角恒等式:

\frac{1}{tan ( x )} = cot (x)

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

解答补常数

= \frac{1}{π} (- cot (π x) + tan (π x)) + C

作图

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