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22. The angle of elevation of a cloud at a height h above the level of water in a lake is a and the angle of depression of its image in the lake is B. The height of the cloud above the surface of the lake is equal to (1 hſtanß + tana) (tanß - tana) (2) hcos(a + B) sin(-a) (2 h(coat + cotß) (3) cosa - cosß (4) h

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