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The tangents of angles subtended by a cower at four points \( A , B , C \) and \( D \) on the ground are in \( \mathrm { H.P. } \) If \( O \) be the foot of the tower on the ground, then (a) \( \mathrm { OA } + \mathrm { OC } = \mathrm { OB } + \mathrm { OD } \)

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