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IF 8 cos 2 theta + 8 sec 2 theta =...

IF ` 8 cos 2 theta + 8 sec 2 theta = 65 , 0 lt (pi)/(2)` , then the value of 4 cos ` 4 theta ` is equal to

A

`(-33)/(8)`

B

`(-31)/(8)`

C

`(-31)/(32)`

D

`(-33)/(32)`

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The correct Answer is:
B
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NEW JOYTHI PUBLICATION-TRIGONOMETRIC FUNCTIONS-QUESTIONS FROM COMPETITIVE EXAMS
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  2. the value of 1/8 (3-4 cos 2 theta + cos 4 theta ) is

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  3. IF 8 cos 2 theta + 8 sec 2 theta = 65 , 0 lt (pi)/(2) , then ...

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  13. IF tan ( theta/2) = (2)/(3) , then sec theta =

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  15. Suppose o lt t lt (pi)/(2) and sin t + cos t =1/5 then tan "" t...

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