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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 `alpha` , then

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The correct Answer is:
`3cot beta - cot gamma`
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