If cos7theta=costheta-sin4theta, then th...

If `cos7theta=costheta-sin4theta`, then the general value of `theta` is

A

(a) `(npi)/(4),(npi)/(3)+(pi)/(18)`

B

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

C

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

D

(d) `(npi)/(6),(npi)/(3)+(-1)^(n)(pi)/(18)`

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The correct Answer is:

C

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