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[" If "alpha,beta,gamma" in "A,P,PT cot beta=(sin alpha-sin gamma)/(cos gamma-cos alpha)],[" Let "A,A_(2),...,A_(h)" be the vertices of an n-sided regular polygon such that ";(1)/(A_(1)A_(2))=(1)/(A_(1)A_(3))+],[" the value of "n" ."]

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