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cot x-2 cot 2x = tan x...

cot x-2 cot 2x = tan x

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`LHS= ((1)/(tan x) -(2)/(tan 2x)) -{(1)/(tan x) -(2(1-tan^(2)x)/(2 tan x))}= (tan^(2)x)/(tan x) = tan x =RHS`
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