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If the angle of elevation of a cloud fro...

If the angle of elevation of a cloud from a point h metres above the surface of a lake is `alpha` and the angle of depression of its reflexion in the lake is `beta`, prove that the height of the cloud is `(h (tan beta + tan alpha))/(tan beta - tan alpha)` metres.

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