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If (1)/(sqrt2) lt x lt 1, then prove tha...

If `(1)/(sqrt2) lt x lt 1`, then prove that `cos^(-1) x + cos^(-1) ((x + sqrt(1 - x^(2)))/(sqrt2)) = (pi)/(4)`

A

`2 cos x^(-1)`

B

`2 cos^(-1)x`

C

`(pi)/(4)`

D

0

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