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A tower AB leans towards west making an ...

A tower AB leans towards west making an angle `alpha ` with the vertical . The anlgular elevation of B , the topmost point of the tower is `beta` as obsreved from a point C due east of A at distance d from A.If the angular elevation of B from a pont D at a distance 2d due east of C is `gamma` , then prove that 2 tan `alpha` = cot `gamma` -cot `beta`

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