This video explains step by step how to solve an equation with half angle formulas. The problem that we will solve is sin(x/2)+cos(x)-1=0. When solving this problem you need to make sure to check for extraneous solutions. Because we squared both sides, we may have created answers that are not really solutions to the problem. To check for extraneous solutions, plug your answer values back into the original formula, and check if the answer is true.
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