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T O P I C R E V I E W
sreesuja	Posted - 03/23/2011 : 00:01:12 Please help me out with this 2 sums 1) The angle of elevation of a cloud from point h metres above the surface of a lake is and the angle of depression of its reflection in the lake is . Prove that the height of the cloud above the lake is h(tan +tan )(tan -tan )