Merci!
Last edited by Lolcano; Jun 9th 2010 at 07:21 AM.
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Originally Posted by Lolcano So, I need help with this problem. Solve: cos 2 x(2 cos x+1) = 0 for 0 <= x < 360 set each factor equal to 0 ...
Originally Posted by Lolcano So, I need help with this problem. Solve: cos 2 x(2 cos x+1) = 0 for 0 <= x < 360 Using the double angle trig identities, cos 2 x can be simplified to: 2 cos^2 x - 1 2 cos^2 x - 1(2 cos x + 1) Be careful, should be Expand this a make a substitution i.e. and solve for using the quadratic formula
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