Evaluate `tan210^(@)`

Explanation

To evaluate \( \tan(210^\circ) \), we will follow these steps:

### Step 1: Identify the Quadrant
The angle \( 210^\circ \) is in the third quadrant. In the third quadrant, the tangent function is positive.

**Hint:** Remember the CAST rule: In the third quadrant, tangent and cotangent are positive.

### Step 2: Rewrite the Angle
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