$\cos ^2 10^{\circ}-\cos 10^{\circ} \cdot \cos 50^{\circ}+\cos ^2 50^{\circ}$ નું મૂલ્ય શોધો.

  • A
    $\frac{3}{2}+\cos 20^{\circ}$
  • B
    $\frac{3}{4}(1+\cos 20^{\circ})$
  • C
    $\frac{3}{4}$
  • D
    $\frac{1}{2}$

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