Evaluate : `cos60^(@)cos30^(@)+ sin 60^(@)sin30^(@)`

Explanation

To evaluate the expression \( \cos 60^\circ \cos 30^\circ + \sin 60^\circ \sin 30^\circ \), we can follow these steps:

### Step 1: Identify the values of trigonometric functions
We know the following values:
- \( \cos 60^\circ = \frac{1}{2} \)
- \( \cos 30^\circ = \frac{\sqrt{3}}{2} \)
- \( \sin 60^\circ = \frac{\sqrt{3}}{2} \)
- \( \sin 30^\circ = \frac{1}{2} \)
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