यदि $\sin A + \sin B = x$ और $\cos A + \cos B = y$ है,तो $\sin(A + B) = $

  • A
    $\frac{2xy}{x^2 + y^2}$
  • B
    $\frac{xy}{x^2 + y^2}$
  • C
    $\frac{2xy}{x^2 - y^2}$
  • D
    $\frac{xy}{x^2 - y^2}$

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