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(d^(2))/(dx^(2))(2cosx*cos3x)=...

`(d^(2))/(dx^(2))(2cosx*cos3x)=`

A

`2^(2)(cos2x+2^(2)cos4x)=`

B

`2^(2)(cos2x-2^(2)cos4x)=`

C

`2^(2)(-cos2x+2^(2)cos4x)=`

D

`-2^(2)(-cos2x+2^(2)cos4x)=`

Text Solution

Verified by Experts

The correct Answer is:
D
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