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[" If the parts."],[" If the angle of el...

[" If the parts."],[" If the angle of elevation of a cloud from a "],[" point "h" m above a lake is "alpha" and the angle of "],[" depression of its reflection in the lake be "beta,],[" prove that the distance of the cloud from the "],[" prove that the distance of the cloud from the "],[" prove that the distance of the cloud from the "],[" point of observation is "(2h sec alpha)/(tan beta-tan alpha)]

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