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受欢迎的微积分 >

integral of 1/(sqrt((a^2-x^2)^3))

解答

\int \frac{1}{( a ^{2} - x ^{2} ) ^{3}} d x

解答

\frac{x}{a ^{2} - x ^{2} + a ^{2}} + C

求解步骤

\int \frac{1}{( a ^{2} - x ^{2} ) ^{3}} d x

(a^{2} - x^{2})^{3} = (a^{2} - x^{2})^{\frac{3}{2}},

假定

(a^{2} - x^{2}) \geq 0

= \int \frac{1}{( a ^{2} - x ^{2} ) ^{\frac{3}{2}}} d x

a^{2} - x^{2} = a^{2} (1 - \frac{x ^{2}}{a ^{2}})

= \int \frac{1}{( a ^{2} ( 1 - \frac{x ^{2}}{a ^{2}} ) ) ^{\frac{3}{2}}} d x

使用指数法则:

\frac{a ^{n}}{b ^{n}} = (\frac{a}{b})^{n}

\frac{x ^{2}}{a ^{2}} = (\frac{x}{a ^{2}})^{2}

= \int \frac{1}{( a ^{2} ( 1 - ( \frac{x}{a ^{2}} ) ^{2} ) ) ^{\frac{3}{2}}} d x

使用指数法则:

(a \cdot b)^{n} = a^{n} \cdot b^{n}

(a^{2} (1 - (\frac{x}{a ^{2}})^{2}))^{\frac{3}{2}} = (a^{2})^{\frac{3}{2}} ((1 - (\frac{x}{a ^{2}})^{2}))^{\frac{3}{2}}

= \int \frac{1}{( a ^{2} ) ^{\frac{3}{2}} ( 1 - ( \frac{x}{a ^{2}} ) ^{2} ) ^{\frac{3}{2}}} d x

提出常数:

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

= \frac{1}{( a ^{2} ) ^{\frac{3}{2}}} \cdot \int \frac{1}{( 1 - ( \frac{x}{a ^{2}} ) ^{2} ) ^{\frac{3}{2}}} d x

使用三角换元法

= \frac{1}{( a ^{2} ) ^{\frac{3}{2}}} \cdot \int a sec^{2} (u) d u

提出常数:

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

= \frac{1}{( a ^{2} ) ^{\frac{3}{2}}} a \cdot \int sec^{2} (u) d u

使用积分常见定则:

\int sec^{2} (u) d u = tan (u)

= \frac{1}{( a ^{2} ) ^{\frac{3}{2}}} a tan (u)

u = arcsin (\frac{1}{a} x)

代回

= \frac{1}{( a ^{2} ) ^{\frac{3}{2}}} a tan (arcsin (\frac{1}{a} x))

化简

\frac{1}{( a ^{2} ) ^{\frac{3}{2}}} a tan (arcsin (\frac{1}{a} x)) : \frac{x}{a ^{2} - x ^{2} + a ^{2}}

= \frac{x}{a ^{2} - x ^{2} + a ^{2}}

解答补常数

= \frac{x}{a ^{2} - x ^{2} + a ^{2}} + C

作图

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