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

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

A

`(3pi)/20`

B

`(17pi)/20`

C

`(7pi)/10`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
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