The general value theta obtained from th...

The general value `theta` obtained from the equation `cos3theta=sinalpha` is

A

(a) `2theta=(pi)/(2)-alpha`

B

(b) `theta=2npipm((pi)/(2)-alpha)`

C

(c) `theta=(npi+(-1)^(n)alpha)/(2)`

D

(d) `theta=2npi/3pm((pi)/(6)-(alpha)/(3))`

Verified by Experts

The correct Answer is:

D

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