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

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

A

`(3 pi)/(20)`

B

`(17 pi)/(20)`

C

`(7 pi)/(10)`

D

`(21 pi)/(20)`

Text Solution

Verified by Experts

The correct Answer is:
B
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HIMALAYA PUBLICATION-INVERSE TRIGONOMETRIC FUNCTIONS-QUESTION BANK
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