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यदि 5(tan^(2)x - cos^(2)x) = 2 cos 2x + ...

यदि `5(tan^(2)x - cos^(2)x) = 2 cos 2x + 9`, तो cos 4x का मान है

A

`(-3)/(5)`

B

`(1)/(3)`

C

`(2)/(9)`

D

`(-7)/(9)`

लिखित उत्तर

Verified by Experts

The correct Answer is:
D
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