cos 2 theta cos 2phi + sin^(2) (theta...

`cos 2 theta cos 2phi + sin^(2) (theta - phi) - sin^(2) (theta + phi )` बराबर हैं

A

sin 2 ( theta + phi)`

B

`cos 2 ( theta + phi)`

C

`sin 2( theta - phi)`

D

`cos 2 ( theta - phi)`

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