यदि $\sin x + \sin y = p$ और $\cos x + \cos y = q$ है,तो $\sec(x + y) = $

  • A
    $\frac{2pq}{p^2 + q^2}$
  • B
    $\frac{p^2 + q^2}{q^2 - p^2}$
  • C
    $\frac{2pq}{\sqrt{p^2 + q^2}}$
  • D
    $\frac{p + q}{p^2 + q^2}$

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