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 Topic: triple angle formula
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 Triple angle tangent formula 2007-03-15 From sam:Hi I am trying to derive a triple angle formulae for tan. I know i need to use compound and double angle formulae but am finding it difficult to "clean" up my fraction to get the triple angle formulae can you show me a worked derivation?! thanksAnswered by Penny Nom. sin(3a), cos(3a) and tan(3a) 2007-02-28 From mailene:hi, i...indeed,to..need..your..help how..cn..i..prove..this,formula??? sin3a=3sina-4sin^3a cos3a=4cos^3-3cosa tan3a=3tan-tan^3a /1-3tan^2a the..symbol...^is..the..expOnentAnswered by Haley Ess and Penny Nom. Finding the missing side of a triangle 2005-01-20 From Jason:I found a geometry problem that reads as follows:In triangle ABC, Answered by Penny Nom. Triple angle formula 2000-02-23 From Sara:Can one derive a triple angle formula for sine and cosine? If so, how? Answered by Chris Fisher.

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