Show that: `t a n(60^0+theta)t a n(60^0-theta)=(2cos2theta+1)/(2cos2theta-1)`

Explanation

To prove the expression \( \tan(60^\circ + \theta) \tan(60^\circ - \theta) = \frac{2 \cos 2\theta + 1}{2 \cos 2\theta - 1} \), we will follow these steps:

### Step 1: Use the tangent addition and subtraction formulas
We start with the left-hand side of the equation:
\[ \tan(60^\circ + \theta) \tan(60^\circ - \theta) \]
Using the tangent addition formula:
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