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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

`-(7)/(9)`

B

`-(3)/(5)`

C

`(1)/(3)`

D

`(2)/(9)`

Text Solution

Verified by Experts

The correct Answer is:
A
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