If sin beta is the geometric mean betwee...

If `sin beta` is the geometric mean between `sin alpha` and `cos alpha` then `cos 2 beta=`

A

`2 sin^(2) ((pi)/(4)- alpha)`

B

`2cos^(2) ((pi)/(4)- alpha)`

C

`2cos^(2) ((pi)/(4) + alpha)`

D

`2 sin^(2) ((pi)/(4) + alpha)`

Verified by Experts

The correct Answer is:

A, C

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