જો $\sin x + \sin y = \alpha$ અને $\cos x + \cos y = \beta$ હોય,તો $\operatorname{cosec}(x + y) = $

  • A
    $\frac{\beta^2 - \alpha^2}{\beta^2 + \alpha^2}$
  • B
    $\frac{2 \alpha \beta}{\beta^2 - \alpha^2}$
  • C
    $\frac{\alpha^2 + \beta^2}{2 \alpha \beta}$
  • D
    $\frac{2 \alpha \beta}{\beta^2 + \alpha^2}$

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