Find the general value of `theta` from the equation `tantheta+tan2theta+tan3theta=tantheta*tan2theta*tan3theta.`

Explanation

To solve the equation \( \tan \theta + \tan 2\theta + \tan 3\theta = \tan \theta \cdot \tan 2\theta \cdot \tan 3\theta \), we will follow these steps:

### Step 1: Rearranging the Equation
We start by rearranging the given equation:
\[ \tan \theta + \tan 2\theta + \tan 3\theta - \tan \theta \cdot \tan 2\theta \cdot \tan 3\theta = 0 \]
This can be rewritten as:
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