Find the sum of series `co sec theta+co sec 2 theta+co sec 4 theta+.......` to n terms

Explanation

To find the sum of the series \( \csc \theta + \csc 2\theta + \csc 4\theta + \ldots \) up to \( n \) terms, we can follow these steps:

### Step 1: Rewrite the terms in the series
The cosecant function can be expressed in terms of sine:
\[ \csc x = \frac{1}{\sin x} \]
Thus, we can rewrite the series as:
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