Let a chord join YZ, then angle XYZ = 90° and angle XZY = 90 - 54 = 36°
angle OYZ = angle XZY = 36°
Therefore, the measure of YZ = 180 - 36 - 36 = 108°
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The like terms are 2xy, -xy and (1/2)xy, since they have the same variables and powers.
Answer:
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