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

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

A

`(3pi)/(20)`

B

`(17pi)/(20)`

C

`(7pi)/(10)`

D

`(3pi)/(10)`

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The correct Answer is:
B
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TARGET PUBLICATION-TRIGONOMETRIC FUNCTIONS -Evaluation Test
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