Evaluate using multiple angle formula: `tan15^@`

Explanation

To evaluate \( \tan 15^\circ \) using the multiple angle formula, we can use the formula for \( \tan(2\theta) \). The formula is given by:

\[ \tan(2\theta) = \frac{2\tan(\theta)}{1 - \tan^2(\theta)} \]

### Step-by-step Solution:

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