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The value of cos^(-1){1/(sqrt(2))("cos"(...

The value of `cos^(-1){1/(sqrt(2))("cos"(9pi)/10-"sin"(9pi)/10)}` is

A

`(3pi)/20`

B

`(7pi)/10`

C

`(7pi)/20`

D

`(17pi)/20`

Text Solution

Verified by Experts

The correct Answer is:
D
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