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(d ^(20))/(dx ^(20)) [ 2 cos x cos 3x]=...

`(d ^(20))/(dx ^(20)) [ 2 cos x cos 3x]=`

A

`2^(20)(cos 2x - 2^(20) cos 3x)`

B

`2^(20)(cos 2x + 2^(20) cos 4x)`

C

`2^(20)(sin 2x + 2^(20) sin 4x)`

D

`2^(20)(sin 2x - 2^(20) sin 4x)`

Text Solution

Verified by Experts

The correct Answer is:
B
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