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If 8 cos 2theta+8sec2theta=65,0<(theta)<...

If `8 cos 2theta+8sec2theta=65`,`0<(theta)<(pi/2)` then the value of `4 cos 4theta`is equal to

A

1) `-33/8`

B

2) `-31/8`

C

3) `-31/32`

D

4) `-33/32`

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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)

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