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tan-x-tan-2x-tan-4x-tan-2-n-x-

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Question Number 764 by prakash jain last updated on 13/Mar/15
tan x+tan 2x+tan 4x+...+tan 2^n x=?
$$\mathrm{tan}\:{x}+\mathrm{tan}\:\mathrm{2}{x}+\mathrm{tan}\:\mathrm{4}{x}+…+\mathrm{tan}\:\mathrm{2}^{{n}} {x}=? \\ $$

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