The value of cos^(-1){1/sqrt2(cos((9pi)/...

The value of `cos^(-1){1/sqrt2(cos((9pi)/10)-sin((9pi)/10))}`

A

(a) `(3pi)/(20)`

B

(c) `(17pi)/(20)`

C

(c) `(7pi)/(10)`

D

(d) `(3pi)/(10)`

Verified by Experts

The correct Answer is:

B

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