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int0^(pi//6)cosxcos2x dx...

`int_0^(pi//6)cosxcos2x dx`

A

`(1)/(4)`

B

`(5)/(12)`

C

`(1)/(3)`

D

`(7)/(12)`

Text Solution

Verified by Experts

`I=(1)/(2)int_(0)^(pi//6)[cos3x+cosx]dx=(1)/(2)[(sin3x)/(3)+sinx]_(0)^(pi//6)=(15)/(12)`.
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