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"The integral " int(dx)/(x^(2)(x^(2)+1)^...

`"The integral " int(dx)/(x^(2)(x^(2)+1)^(1/2))" equals"`

A

`((x^(2)+1)/(x^(2)))^(1//2)+c`

B

`(x^(2)+1)^(1/2)+c`

C

`-(x^(2)+1)^(1/2)+c`

D

`-((x^(2)+1)/(x^(2)))^(1/2)+c`

Text Solution

Verified by Experts

The correct Answer is:
D
` I=int(dx)/(x^(2)(x^(4)+1)^(3//4))`
` int(dx)/(x^(5)(1+(1)/(x^(4)))^(3//4))`
`"Let "1+(1)/(x^(4))=t^(4)`
`implies (-4)/(x^(5))dx=4t^(3)dt " or " (dx)/(x^(5))=-t^(3)dt`
` :. I=int(-t^(3)dt)/(t^(3))=-t+c=-(1+(1)/(x^(4)))^(1//4)+c`
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