This problem is about trigonometric equations that we have to solve using the half angle formulas we learned earlier in this unit. By substituting in a trigonometric half-angle formula for a certain expression, we can then use algebra, the unit circle, and the trig identities to simplify the new equation.
Pay special attention to the caution I practiced when I started a new step for every thing I did. I did this so that it would be less likely for me to make a mistake.
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