$cosec^2 \theta = \frac{4xy}{(x + y)^2}$ केवल तब सत्य है यदि

  • 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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