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Differential Calculus Booster with Problems and Solutions for JEE Main and Advanced
Prove that
$$
\begin{aligned}
&\tan \left(\tan ^{-1} x+\tan ^{-1} y+\tan ^{-1} z\right) \\
&\quad=\cot \left(\cot ^{-1} x+\cot ^{-1} y+\cot ^{-1} z\right)
\end{aligned}
$$