\begin{aligned} \tan 3 A-\tan 2 A-\tan A & \\ &=\tan 3 A \tan 2 A \tan – InterviewSolution

1.	\begin{aligned} \tan 3 A-\tan 2 A-\tan A & \\ &=\tan 3 A \tan 2 A \tan A \end{aligned}
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