$cosec^2\theta $ = $\frac{4xy}{(x +y)^2}$ is true if and only if
$cosec^2\theta $ = $\frac{4xy}{(x +y)^2}$ is true if and only if
- A
$x + y$ $\neq$ $0$
- B
$x = y$, $x$ $\neq$ $0$
- C
$x = y$
- D
$x$ $\neq$ $0$, $y$ $\neq$ $0$
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- [AIEEE 2012]
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