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If 5 (tan ^(2) x - cos ^(2) x ) = 2 cos ...

If `5 (tan ^(2) x - cos ^(2) x ) = 2 cos 2x +9`, then the value of `cos 4 x ` is

A

`-3//5`

B

`1//3`

C

`2//9`

D

`-7//9`

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The correct Answer is:
D
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VMC MODULES ENGLISH-TRIGONOMETRIC IDENTITIES AND EQUATIONS -JEE Main (Archive)
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