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If 2^x = cos(y/2) and a^x = sin y , then...

If `2^x = cos(y/2)` and `a^x = sin y` , then `sin(y/2)` is equal to

A

`1/2(a/2)^(x)`

B

`(a/2)^(x)`

C

`(a^(x))/(2)`

D

`2^(pi//2)`

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The correct Answer is:
A
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