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

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

A

`-7/9`

B

`-3/5`

C

`1/3`

D

`2/9`

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