Prove that: `cos 10^@cos30^@cos 50^@cos 70^@=3/(16)`

Explanation

To prove that \( \cos 10^\circ \cos 30^\circ \cos 50^\circ \cos 70^\circ = \frac{3}{16} \), we will follow these steps:

### Step 1: Substitute the value of \( \cos 30^\circ \)

We know that:
\[ \cos 30^\circ = \frac{\sqrt{3}}{2} \]
...