Asked by Anonymous

given that cot 2 pi/7 = tan z first express 2pi/7 as a different between pi/2 and a angle and then apply a confunction identity to determine the measure of angle z
Answered by oobleck
cot x = tan(pi/2 - x)
so, z = 1/2 pi - 2/7 pi = 3/14 pi
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