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Q)

$\sin^2 \theta = \frac{4xy}{(x+y)^2}$ is true if and only is :


( A ) $ x + y \neq 0$
( B ) $x=y$
( C ) $x = y, \; x \neq 0, \; y \neq 0$
( D ) $ x \neq 0, \; y \neq 0$

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