$(\sin 210^{\circ})(\sin 585^{\circ})$ का मान क्या है?

  • A
    $\frac{1}{2 \sqrt{2}}$
  • B
    $\frac{-1}{2 \sqrt{2}}$
  • C
    $\frac{1}{\sqrt{3}}$
  • D
    $\frac{-1}{\sqrt{3}}$

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