Evaluate : `int(tan^(2)x)dx`
Evalauate: `int1/(1+sinx)`dx

Explanation

To evaluate the integrals \(\int \tan^2 x \, dx\) and \(\int \frac{1}{1 + \sin x} \, dx\), we will go through the steps for each integral separately.

### Part 1: Evaluate \(\int \tan^2 x \, dx\)

1. **Use the identity for \(\tan^2 x\)**:
\[ \tan^2 x = \sec^2 x - 1 \]
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