Mathematics.Geometry & Trigonometry

Mathematics Forum

Author	Message / Information
ineedhelp23 Quote \| Reply \|	Trig questions posted on: 11/15/2006 12:30:49 PM Can someone please help me I need this ASAP !!! Verify Identity: 1. cos 3x - cos x = 4cos cubed x - 4 cos x Solve solution. 2. 3cos squared x - 5cosx + 2 = 0 Solve solution. 3. sin 3x-sin x = 0
herbert Quote \| Reply \|	Trig questions replied on: 11/15/2006 1:16:56 PM 2nd problem substituting y = cos(x) makes 3y^2 -5y = -2 this is a simple equation having y1 and y2 for its solution guessing makes me to assume that y1=1 and y2 =2/3 so x = arcsin(1) or arcsin(2/3)
herbert Quote \| Reply \|	Trig questions replied on: 11/15/2006 1:29:37 PM the other two equations should be simplified according to cos(x)^3 =( 3cos(x)+ cos(3x) )/4 sin(x)^3 = ( 3sin(x) - sin(3x) )/4 the resulting expressions to be solved are simple and don´t require explanation
ineedhelp23 Quote \| Reply \|	Trig questions replied on: 11/15/2006 1:36:11 PM Thanks !!!!! : )
ineedhelp23 Quote \| Reply \|	Trig questions replied on: 11/15/2006 1:37:29 PM Thanks : ) !!!!
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