jjlenore22 jjlenore22

23-09-2020
Mathematics

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What determines whether to use + or - in the half-angle formula for sine or cosine?

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Eighty8 Eighty8

23-09-2020

In the half-angle formula for sine and cosine, notice that a plus/minus sign appears in front of each radical (square root). Whether your answer is positive or negative depends on which quadrant the new angle (the half angle) is in

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