Solve this following

Question:

The value of $\cos ^{2} 10^{\circ}-\cos 10^{\circ} \cos 50^{\circ}+\cos ^{2} 50^{\circ}$ is

  1. $\frac{3}{2}\left(1+\cos 20^{\circ}\right)$

  2. $\frac{3}{4}$

  3. $\frac{3}{4}+\cos 20^{\circ}$

  4. $\frac{3}{2}$


Correct Option: , 2

Solution:

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