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If 8cos2theta+8sec2theta=65,0ltthetaltpi...

If `8cos2theta+8sec2theta=65`,`0ltthetaltpi/2`, then the value of `4cos4theta` is equal to..............
A) `-(33)/(8)` B) `-(31)/(8)` C) `-(33)/(32)` D) `-(31)/(32)`

A

`-(33)/(8)`

B

`-(31)/(8)`

C

`-(31)/(32)`

D

`-(33)/(32)`

Text Solution

Verified by Experts

The correct Answer is:
B
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