If 8 cos 2 theta + 8 sec 2 theta = 65, 0...

If `8 cos 2 theta + 8 sec 2 theta = 65, 0 lt theta lt (pi)/(2)`, then the value of 4 cos 4 `theta` is equal to a)`(-23)/(8)` b)`(-31)/(8)` c)`(-31)/(32)` d)`(-33)/(32)`

A

`(-23)/(8)`

B

`(-31)/(8)`

C

`(-31)/(32)`

D

`(-33)/(32)`

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The correct Answer is:

B

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