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[" If "P" is any point on ellipse with foci "S_(1)&S_(2)" and eccentricity is "(1)/(2)" such that "],[/_PS_(1)S_(2)=alpha,/_PS_(2)S_(1)=beta,/_S_(1)PS_(2)=gamma" ,then "cot(alpha)/(2),cot(gamma)/(2),cot(beta)/(2)" are in "]

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