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int cos x cos 2x cos 3x dx=...

`int cos x cos 2x cos 3x dx=`

A

`(1)/(4)[(1)/(6) sin 6x+(1)/(2) sin -(1)/(4)sin 4x+x]+c`

B

`(1)/(4)[(1)/(6) sin 6x-(1)/(2) sin -(1)/(4)sin 4x+x]+c`

C

`(1)/(4)[(1)/(6) sin 6x+(1)/(2) sin2x +(1)/(4)sin 4x+x]+c`

D

none

Text Solution

Verified by Experts

The correct Answer is:
C
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