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受欢迎的微积分 >

integral of 1/(sin^2(mx)cos^4(mx))

解答

\int \frac{1}{sin ^{2} ( m x ) cos ^{4} ( m x )} d x

解答

\frac{1}{m} (- cot (m x) + 2 tan (m x) + \frac{1}{3} tan^{3} (m x)) + C

求解步骤

\int \frac{1}{sin ^{2} ( m x ) cos ^{4} ( m x )} d x

使用换元积分法

= \int \frac{1}{m cos ^{4} ( u ) sin ^{2} ( u )} d u

提出常数:

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

= \frac{1}{m} \cdot \int \frac{1}{cos ^{4} ( u ) sin ^{2} ( u )} d u

使用三角换元法

= \frac{1}{m} \cdot \int \frac{( 1 + v ^{2} ) ^{2}}{v ^{2}} d v

乘开

\frac{( 1 + v ^{2} ) ^{2}}{v ^{2}} : \frac{1}{v ^{2}} + 2 + v^{2}

= \frac{1}{m} \cdot \int \frac{1}{v ^{2}} + 2 + v^{2} 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}{m} (\int \frac{1}{v ^{2}} d v + \int 2 d v + \int v^{2} d v)

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

\int 2 d v = 2 v

\int v^{2} d v = \frac{v ^{3}}{3}

= \frac{1}{m} (- \frac{1}{v} + 2 v + \frac{v ^{3}}{3})

代回

= \frac{1}{m} (- \frac{1}{tan ( m x )} + 2 tan (m x) + \frac{tan ^{3} ( m x )}{3})

化简

\frac{1}{m} (- \frac{1}{tan ( m x )} + 2 tan (m x) + \frac{tan ^{3} ( m x )}{3}) : \frac{1}{m} (- cot (m x) + 2 tan (m x) + \frac{1}{3} tan^{3} (m x))

= \frac{1}{m} (- cot (m x) + 2 tan (m x) + \frac{1}{3} tan^{3} (m x))

解答补常数

= \frac{1}{m} (- cot (m x) + 2 tan (m x) + \frac{1}{3} tan^{3} (m x)) + C

作图

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