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General value of theta obtained from the...

General value of `theta` obtained from the equation `cos 2 theta = sin alpha` is

A

`2 theta + alpha = pi/2`

B

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

C

`theta = (npi + (-1)^nalpha)/2`

D

`theta = npi pm(pi/4 - alpha/2)`

Text Solution

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The correct Answer is:
D
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