Mark the correct alternative in the following:

If then is equal to

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If in a ∆ABC, tan A + tan B + tan C = 6, then cot A cot B cot C =

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tan 3A – tan 2A – tan A is equal to

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If and where P and Q both are acute angles. Then, the value of P – Q is

Mark the correct alternative in the following:

If cot (α + β) = 0, then sin (α + 2 β) is equal to