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Quandaries & Queries
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 Topic: double angle formulas
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 Solve for theta 2014-04-25 From ALASTAIR:Hi, The question asks Solve for 'theta' cos2theta=sintheta x costheta. Substituting for cos2th either 1-2sin^2th or 2cos^2th does not give an equation in either sine or cosine alone how do I solve this please?Answered by Penny Nom. sin(3A) 2004-10-20 From A student:Express sin3A in terms of sinA and cosA.Answered by Penny Nom. Some trig expressions 2004-05-23 From A student:Prove: sin A + sin B = 2sin(A+B/2)cos(A-B/2) cos A - cos B = -2sin(A+B/2)sin(A-B/2) cos A + cos B = 2cos(A+B/2)cos(A-B/2) sin A - sin B = 2cos(A+B/2)sin(A+B/2)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. A Trigonometry Question 1999-08-28 From Diane Simms:My question is can the following be factored. I am a teacher who needs the factors to this right away. 2 Sin2X + 2 SinX CosX - 1= 0 Answered by Harley Weston.

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