After finding the values by using half angle formula, how to determined the quadrant
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A + or - sign appears in many of the half angle formulas. You determine which sign to use, and which quadrant the half angle is in, by knowing the value of the FULL angle, A. If A is in the first of secnd quadrant, then A/2 in in the first quadrant. If A is in the third or fourth quadrant, then A is in the second quadrant, etc.
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