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

Explanation

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

### Step 1: Use the sine subtraction formula
We start by applying the sine subtraction formula:
\[ \sin(x-a) = \sin x \cos a - \cos x \sin a \]
This allows us to rewrite the integral:
...