integral of (x+1)/(sqrt(x^2-9))

解答

\int \frac{x + 1}{x ^{2} - 9} d x

x^{2} - 9 + ln (\frac{1}{3} x^{2} - 9 + x) + C

求解步骤

\int \frac{x + 1}{x ^{2} - 9} d x

乘开

\frac{x + 1}{x ^{2} - 9} : \frac{x}{x ^{2} - 9} + \frac{1}{x ^{2} - 9}

= \int \frac{x}{x ^{2} - 9} + \frac{1}{x ^{2} - 9} d x

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

= \int \frac{x}{x ^{2} - 9} d x + \int \frac{1}{x ^{2} - 9} d x

\int \frac{x}{x ^{2} - 9} d x = x^{2} - 9

\int \frac{1}{x ^{2} - 9} d x = ln (\frac{1}{3} x^{2} - 9 + x)

= x^{2} - 9 + ln (\frac{1}{3} x^{2} - 9 + x)

解答补常数

= x^{2} - 9 + ln (\frac{1}{3} x^{2} - 9 + x) + C

\frac{\partial}{\partial x} (- 3 x^{2} y^{3} sin (x^{3} y^{3}))

d er i v a t i v e f (0) = \frac{x}{x ^{2} + 1}

\frac{\partial}{\partial y} (2 x - 3 yz)

\frac{d}{d r} (\frac{200 r ( r + 2 )}{( 2 + 3 r ) ^{2}})

t an g e n t y = 9 - 10 x, at x = - 1