\begin { equation } \tan 3 A-\tan 2 A-\tan A=\tan 3 A \cdot \tan 2 A \ – InterviewSolution

1.	\begin { equation } \tan 3 A-\tan 2 A-\tan A=\tan 3 A \cdot \tan 2 A \cdot \tan \theta \end { equation }
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