Trig Equations with Half Angles and Multiple Angles angle
Example : Solve cos2x cos x 0 over the interval 0,2 . Solution : To solve this we must change cos2x using a double-angle identity (see the formula list) cos2x cos x 0 2cos 2x 1 cos x 0 2cos 2x cos x 1 0 2cos x 1 cos x 1 0 Now divide the the problem into two parts 2cos x 1 0 or cos x 1 0 cos x 1 2 or cos x 1 x 3 or x 5 3 or x ................
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