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5-5-59 solving trig equations
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    When doing this problem, remember we need to factor out what they have in common. So we have cosine X times the quantity 1 + 2 sine X equaling 0. So we know cosine X is going to equal 0 and we know that 1 + 2 sine X is also going to equal 0. Cosine X is 0 when X is π halves and three Pi halves 1 + 2 sine X. If we solve for sine X, we get sine X equaling negative 1/2. Sine X is negative 1/2 at 7 Pi 6 and 11 Pi 6.