If (sin^(-1) x)^2 + (cos^(-1)x)^2 =(5pi^...

If `(sin^(-1) x)^2 + (cos^(-1)x)^2 =(5pi^2)/8`then one of the values of x is

A

1

B

-1

C

`(1)/(sqrt(2))`

D

`-(1)/(sqrt(2))`

Verified by Experts

The correct Answer is:

D

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