Question 756765
Solve for Theta on the interval 0 < or = to theta < or = to 360:  
  cos^2 theta- 3 cos theta = 4
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Solve for Theta on the interval 0 <= theta <= 360:  
  cos^2 theta- 3 cos theta = 4
 cos^2 - 3 cos - 4 = 0
(cos - 4)*(cos + 1) = 0
cos = 4 (no real numuber solution)
cos = -1
theta = 180 degs