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

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

A

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

B

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

C

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

D

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

Text Solution

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The correct Answer is:
C
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TARGET PUBLICATION-TRIGONOMETRIC FUNCTIONS -Critical Thinking
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