Well the sum formula and the half angle formula , are one of the same. They are both correct ways to solve a problem. The answers dont seem to be the same but if we plug them into our calculator they will be the same. I made a mistake on the sum formula I ment to put + rad3 on the Tan. So it is the same just a different way to do it. Its the same because for one you use exact unit circle measures by splitting it into two , and for the half angle you are doubling it to get something alike but that is just one angle.
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