$\sin 780^{\circ} \sin 480^{\circ} + \cos 240^{\circ} \cos 300^{\circ}$ નું મૂલ્ય શોધો.

  • A
    $\frac{1}{2}$
  • B
    $\frac{1}{4}$
  • C
    $1$
  • D
    આમાંથી કોઈ નહીં

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