Please solve

3./ cos3x - sin 3x + 2cosx = 0

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- Jul 21st 2009, 08:04 AMmp3qzSolving a trig equation
Please solve

3./ cos3x - sin 3x + 2cosx = 0 - Jul 22nd 2009, 02:22 PMpickslides
- Jul 23rd 2009, 08:13 AMred_dog
Using the hint of pickslides the equation becomes

$\displaystyle 4\sin^3x+4\cos^3x-3\sin x-\cos x=0$

which is the same equation like in this thread: http://www.mathhelpforum.com/math-he...-equation.html