If `a=costheta+i sintheta,` find the value of `(1+a)/(1-a)dot`

Explanation

To solve the problem, we need to find the value of \(\frac{1 + a}{1 - a}\) where \(a = \cos \theta + i \sin \theta\).

### Step-by-Step Solution:

1. **Substituting the value of \(a\)**:
\[ a = \cos \theta + i \sin \theta \]
...