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" re that "(tan^(2)2x-tan^(2)x)/(1-tan^(...

" re that "(tan^(2)2x-tan^(2)x)/(1-tan^(2)2x tan^(2)x)=tan3x tan x

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tan4x=(4tan x(1-tan^(2)x))/(1-6tan^(2)x+tan^(4)x)

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