Find the principal value of each of the following :
$\tan ^{-1}(-\sqrt{3})$
$\tan ^{-1}(-\sqrt{3})=-\tan ^{-1}(\sqrt{3})\left[\right.$ Formula: $\left.\tan ^{-1}(-x)=-\tan ^{-1}(x)\right]$
$=-\frac{\pi}{3}$
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