Find the integral of function `int tan^2 xdx`

Explanation

To solve the integral \( \int \tan^2 x \, dx \), we can follow these steps:

### Step-by-Step Solution:

1. **Rewrite the integrand**: We know that \( \tan^2 x \) can be expressed in terms of \( \sec^2 x \):
\[ \tan^2 x = \sec^2 x - 1 \]
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