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 Topic: multiple angle formula
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6 items are filed under this topic.

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 cos(x) = sin(x - 1) 2010-04-28 From alex:In the equation cos x = sin x-1 for -pi/2 A: solve for x graphically B: solve algebraically and prove the solution is correct. AlexAnswered by Penny Nom. 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. cos(3X) 2006-03-29 From Joshua:I'm having trouble proving that cos(3X)=cos3X -(cosX)(sin2 X)Answered by Penny Nom. sin(3A) 2004-10-20 From A student:Express sin3A in terms of sinA and cosA.Answered by Penny Nom. sin 2x = cos 3x 2002-02-25 From Allan:solve: sin 2x = cos 3x Primary question: how do you handle the cos 3x? Answered by Paul Betts and Chris Fisher. 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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