1. Solve for x:  cos 2x = 1 - cos x for 0 < x < 2pi
   
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2. Solve for x:  cos 2x - sin x > 0  for 0 < x < 2pi
   
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3. Solve for x:  2 sin 2x = 1 for 0^o < x < 360^o
   
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