Prove that tan3x-tan2x-tanx=tan3xtan2xtanx

Answer 1

x + 2x = 3x
tan (x+2x) = tan 3x
(tan x + tan 2x) / 1 - tanx.tan2x = tan3x
(tan x + tan 2x) = tan3x(1 - tanx.tan2x)
(tan x + tan 2x) = tan3x - tan3x tan2x tanx
tanx + tan2x - tan3x = - tan3x tan2x tanx
tan3x-tan2x-tanx = tan3x tan2x tanx

Answer 2

X 2

Answer 3

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Answer 4

Solve this question