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If intsin^(-1)xcos^(-1)xdx=f^(-1)(x) [π...

If `intsin^(-1)xcos^(-1)xdx=f^(-1)(x)` `[π/2x-xf^(-1)(x)-2sqrt(1-x^2)]+2x+C ,t h e n` `f(x)=sinx` (b) `f(x)=cosx` `A=pi/4` (d) `A=pi/2`

A

`f(x)=sinx`

B

`f(x)=cosx`

C

`A=(pi)/(4)`

D

`A=(pi)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
A, D
`int sin^(-1)x cos^(-1)x dx=int [(pi)/(2) sin^(-1)x-(sin^(-1)x)^(2)]dx`
`=(pi)/(2) (x sin^(-1)x+sqrt(1-x^(2)))-(x(sin^(-1)x)^(2)+2sin^(-1)xsqrt(1-x^(2))-2x)+C " (Integrating by parts)" `
`=sin^(-1)x[(pi)/(2)x-x sin^(-1)x-2 sqrt(1-x^(2))]+(pi)/(2)sqrt(1-x^(2))+2x+C`
` :. f^(-1)(x)=sin^(-1)x,f(x)=sinx`
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