Question 72219
Well for one thing, I think you have a flaw in your simplification process. In order to solve for theta you have to take the arcsine of both sides. If you  take the arcsine of -3, you wont get a real number. The reason why is because the function sine is defined on a unit circle as: opposite side/hypotenuse. Since the opposite side is always going to be smaller (the hypotenuse is the largest side) the fraction will always be smaller than 1. Actually the range of sin(theta) is -1<=y<=1. Try to redo the problem, or post the whole thing, to get the absolute value of the number less or equal to 1.