The angle of elevation of a cloud from a...

The angle of elevation of a cloud from a height h above the level of water in a lake is `alpha` and the angle of depressionof its image in the lake is `beta`. Find the height of the cloud above the surface of the lake:

`hcotbeta`

`h(cotalpha+cotbeta)`

`hcotalpha`

`h((cotalpha+cotbeta)/(cotalpha-cotbeta))`

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