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A building stands on a horizontal plane ...

A building stands on a horizontal plane and is surmounted by a vertical flag-stagg of height h. At a point on the plane, the angles of elevation of the bottom and the top of the flag-staff are `alpha and beta` respectively. Prove that the height of the building is `(h tan alpha)/(tan beta-tan alpha)`

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The correct Answer is:
`( h tan alpha)/(tan beta- tan alpha)`
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