(d^(2))/(dx^(2))(2 cos x cos 3x) is equa...

`(d^(2))/(dx^(2))(2 cos x cos 3x)` is equal to

A

`2^(2)(cos 2x +2^(2) cos 4x)`

B

`2^(2) (cos 2x -2^(2) cos 4x)`

C

`2^(2)(- cos 2x + 2^(2) cos 4x)`

D

`-2^(2)(cos 2x +2^(2) cos 4x)`

Verified by Experts

The correct Answer is:

D

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