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

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

A

`(n pi)/(4), (n pi)/(3) + (pi)/(18)`

B

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

C

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

D

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

Text Solution

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The correct Answer is:
C
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