Evaluate : `int(sin(x-a))/(sin(x+a))dx`

Explanation

To evaluate the integral \( I = \int \frac{\sin(x - a)}{\sin(x + a)} \, dx \), we can follow these steps:

### Step 1: Substitution
Let \( t = x + a \). Then, we differentiate to find \( dx \):
\[ dx = dt \]
Also, we can express \( x \) in terms of \( t \):
...