If `cos p theta+cos q theta=0`, then prove that the different values of `theta` are in A.P. with common difference `2pi// (p pm q)`.

Explanation

To prove that the different values of \( \theta \) satisfying the equation \( \cos p\theta + \cos q\theta = 0 \) are in Arithmetic Progression (A.P.) with a common difference of \( \frac{2\pi}{p \pm q} \), we can follow these steps:

### Step 1: Rewrite the Equation
Start with the given equation:
\[ \cos p\theta + \cos q\theta = 0 \]
This can be rewritten as:
...