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 Sujet: double angle
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 sin 2x - sin x = 0 2016-04-24 lilly pose la question :sin 2x - sin x = 0 0Penny Nom lui répond. Solve for theta 2014-04-25 ALASTAIR pose la question :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?Penny Nom lui répond. siin (A) and sin (A/2) 2013-05-09 shanaia pose la question :given that sin A=4/5 and A is obtuse.find sin (A/2)Penny Nom lui répond. Tan(x+pi)-tan(pi-x)=2tan(x). 2011-01-09 Steven pose la question :Verify the identity: Tan(x+pi)-tan(pi-x)=2tan(x)Penny Nom lui répond. A trig equation 2010-04-28 Steve pose la question :2cos^2(X)-2sin^2(x)+1=0Harley Weston lui répond. Trigonometry and picture hanging 2010-01-13 george pose la question :The top of a picture 1m high 0.8m from the ceiling. At a point on the ceiling directly in front of the picture, we wish to install a light so that the angle subtended by the picture equals to the angle of depression of the top of the picture. How far out from the wall should the light be installed?Penny Nom lui répond. TRIG IDENTITIES 2008-08-17 VINCE pose la question :HOW DO YOU SIMPLIFY THE FOLLOWING:- 2sin3(theta)cos3(theta)? RegardsHarley Weston lui répond. Graphing Using Double Angle Identities 2008-07-16 Hodan pose la question :the Question is: Describe how you could use your knowledge of Double angle formulas to sketch the graph of each function. Include a sketch with your description.A) F(x)=sin x cos x B)F(x)=2 cos(squared)x C) F(x)= tan(x) (divided) by 1-tan(squared) xJanice Cotcher lui répond. sin(2x)/sin(3x) 2008-06-19 matt pose la question :how does sin2x break down (not with identities) and how would sin3x be created. My prob. is sin 2x/ sin 3x and I want to know how the double(or triple angle) would break down. I want to be able to cancel out sins. Thanks!Harley Weston lui répond. sin x + sin 2x + sin 3x + sin 4x = 0 2005-05-10 Elia pose la question :I tried many times, but can't get to solve the following question: sin x + sin 2x + sin 3x + sin 4x = 0Chris Fisher lui répond. cos(2x) = sin(3x) 2005-04-14 A student pose la question :Show that if x= 18 degrees, then cos2x =sin 3x. HENCE find the exact value of sin 18 degrees, and prove that cos 36 - sin 18 =1/2.Andrei Volodin, Claude Tardif and Penny Nom lui répond. sin(3A) 2004-10-20 A student pose la question :Express sin3A in terms of sinA and cosA.Penny Nom lui répond. Some trig expressions 2004-05-23 A student pose la question :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)Penny Nom lui répond. Write sin(3x) in terms of sin(x) 2003-05-05 A student pose la question :Write sin 2x in terms of sin xPenny Nom lui répond. sin 2x = cos 3x 2002-02-25 Allan pose la question :solve: sin 2x = cos 3x Primary question: how do you handle the cos 3x? Paul Betts and Chris Fisher lui répond. Triple angle formula 2000-02-23 Sara pose la question :Can one derive a triple angle formula for sine and cosine? If so, how? Chris Fisher lui répond. A Trigonometry Question 1999-08-28 Diane Simms pose la question :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 Harley Weston lui répond. Sin 4A 1999-06-22 Ryan Cochrane pose la question :If sinA = 4/5, and A is a first quadrant angle, find sin4AHarley Weston lui répond.

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