The value of $\cos ^{2} 10^{\circ}-\cos 10^{\circ} \cos 50^{\circ}+\cos ^{2} 50^{\circ}$ is
$\frac{3}{2}\left(1+\cos 20^{\circ}\right)$
$\frac{3}{4}$
$\frac{3}{4}+\cos 20^{\circ}$
$\frac{3}{2}$
Correct Option: , 2
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