If a = `cos theta +theta i sin, "then find the value of" (1+a)/(1-a)`.

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 \(a\)**:
\[ \frac{1 + a}{1 - a} = \frac{1 + (\cos \theta + i \sin \theta)}{1 - (\cos \theta + i \sin \theta)} \]
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