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int(a^(x//2))/(sqrt(a^(-x)-a^(x)))dx is ...

`int(a^(x//2))/(sqrt(a^(-x)-a^(x)))dx` is equal to

A

`(1)/(loga)sin^(-1)(a^(x))+c`

B

`(1)/(loga)(tan^(-1)(a^(x))+c`

C

`2sqrt(a^(-x)-a^(x))+c`

D

`log(a^(x)-1)+c`

Text Solution

Verified by Experts

The correct Answer is:
A

Let `l=int(a^(x//2))/(sqrt(a^(-x)-a^(x)))dx`
`=int(a^(x))/(sqrt(1-a^(2x)))dx`
Put `a_(x)=t and a^(x)dx=(1)/(loga)dt`
`thereforel=(1)/(loga)int(dt)/(sqrt(1-t^(2)))`
`=(1)/(loga)sin^(-1)t+c`
`=(1)/(loga)sin^(-1)(a^(x))+c`
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