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If sin theta+"cosec"theta=2, then cos^(2...

If `sin theta+"cosec"theta=2`, then `cos^(2015)theta+"cosec"^(2015)theta` is equal to:

A

`-1`

B

0

C

1

D

2015

Text Solution

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The correct Answer is:
c
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  13. Let f(theta)=cos theta cos 2 theta cos 4 theta cos 7 theta, then f(pi/...

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