Sum Formula
Half-angle
I know these two answers are the same for sine, cosine, and tangent because when I plug it into my calculator to check if it matches with my answers the sine for when I used the sum formula and the answer I got from half-angles are the same answer. This is the same for cosine and tangent. Both ways may look like different answers, but they are the same when they are plugged into the calculator it is just a different way of getting to the solution; it still gives the same answer and how I know both ways of solving lead to the same answer.
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