Find the principal value of `tan^(-1)(-1/sqrt3)`.

Explanation

To find the principal value of \(\tan^{-1}\left(-\frac{1}{\sqrt{3}}\right)\), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the given expression:**
\[ \theta = \tan^{-1}\left(-\frac{1}{\sqrt{3}}\right) \]
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