The angle of elevation of an object from...

The angle of elevation of an object from a point P on the level ground is a. Moving d metres on the ground towards the object, the angle of elevation is found to be `beta`. Then the height (in metres) of the object is

` d tan alpha `

` d cot beta `

` ( d)/( cot alpha + cot beta) `

` ( d ) /( cot alpha - cot beta) `

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