Evaluate : `int_(0)^(pi//4) tan ^(2) x dx `

Explanation

To evaluate the integral \( \int_{0}^{\frac{\pi}{4}} \tan^2 x \, dx \), we can follow these steps:

### Step 1: Use the Identity for \(\tan^2 x\)
We know the identity:
\[ \tan^2 x = \sec^2 x - 1 \]
Using this identity, we can rewrite the integral:
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