$\sin 10^{\circ} \cdot \sin 30^{\circ} \cdot \sin 50^{\circ} \cdot \sin 70^{\circ}$ का मान क्या है?

  • A
    $\frac{1}{8}$
  • B
    $\frac{3}{16}$
  • C
    $\frac{\sqrt{3}}{16}$
  • D
    $\frac{1}{16}$

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