The value of tan 3A -tan 2A -tan A is eq...

The value of `tan 3A -tan 2A -tan A` is equal to (A) `tan 3A tan 2A tan A` (B)`-tan 3A tan 2A tan A` (C) `tan A tan 2A-tan 2A tan 3A-tan 3A tan A` (D) none of these

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