यदि $x+y=\frac{\pi}{2}$ है,तो $\sin x \cdot \sin y$ का अधिकतम मान क्या है?

  • A
    $\frac{1}{2}$
  • B
    $\frac{-1}{2}$
  • C
    $\frac{-1}{\sqrt{2}}$
  • D
    $\frac{1}{\sqrt{2}}$

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