The value of `cos^2 10^0-cos10^0cos50^0+cos^2 50^0` is equal to `4/3` (b) `1/3` (c) `3/4` (d) `3`

Explanation

To solve the expression \( \cos^2 10^\circ - \cos 10^\circ \cos 50^\circ + \cos^2 50^\circ \), we will follow these steps:

### Step 1: Rewrite the expression
We start with:
\[ \cos^2 10^\circ - \cos 10^\circ \cos 50^\circ + \cos^2 50^\circ \]

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