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General solution of cos7x=cosx-sin4x is...

General solution of `cos7x=cosx-sin4x` is

A

`(npi)/(4), (npi)/(3)+(-1)^(n)(pi)/(18), ninZ`

B

`(npi)/(3), (npi)/(4)+(-1)^(n)(pi)/(18), ninZ`

C

`(npi)/(4), (npi)/(3)+(-1)^(n)(pi)/(6), ninZ`

D

`(npi)/(4), (npi)/(3)pm(-1)^(n)(pi)/(18), ninZ`

Text Solution

Verified by Experts

The correct Answer is:
A
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