Evaluate `(2cos4 0^(@)-cos2 0^(@))/(sin2 0^(@)`

Explanation

To evaluate the expression \((2 \cos 40^\circ - \cos 20^\circ) / \sin 20^\circ\), we can follow these steps:

### Step 1: Rewrite the expression
We start with the expression:
\[ \frac{2 \cos 40^\circ - \cos 20^\circ}{\sin 20^\circ} \]
We can rewrite \(2 \cos 40^\circ\) as \(\cos 40^\circ + \cos 40^\circ\):
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