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sin^2 theta =(x+y)^2/(4xy) where x,yinR ...

`sin^2 theta =(x+y)^2/(4xy)` where x,y`in`R gives `theta` if and only if

A

`a+y=0`

B

`x=y`

C

`|x|=|y|ne0`

D

none of these

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The correct Answer is:
C
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