Which of the following sets can be the s...

Which of the following sets can be the subset of the general solution of `1+cos3x=2cos2x, (n in Z)` is

A

`npi+(pi)/3`

B

`npi+(pi)/6`

C

`npi-(pi)/6`

D

`2npi`

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The correct Answer is:

B, C, D

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