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int cos 4x cos 3x dx=...

`int cos 4x cos 3x dx=`

A

`(1)/(2)[-(1)/(7) sin 7x+sin ]+c`

B

`(1)/(2)[(1)/(7) sin 7x+sin ]+c`

C

`(1)/(2)[(1)/(7) sin 7x-sin ]+c`

D

none

Text Solution

Verified by Experts

The correct Answer is:
B
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