Question
यदि $A + C = B,$ तब $\tan A\,\tan B\,\tan C = $

Answer

b
(b) $B = A + C \Rightarrow \tan B = \tan (A + C)$ 

==> $\tan B = \frac{{\tan A + \tan C}}{{1 - \tan A\tan C}}$

==> $\tan A\tan B\tan C = \tan B - \tan A - \tan C$.

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