The angle of elevation of an object from...

The angle of elevation of an object from a point P on the level ground is `alpha`. 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`

`dcot beta`

`d/(cot alpha+cot beta)`

`d/(cot alpha-cot beta)`

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