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[" 39.From the top of a light house,the ...

[" 39.From the top of a light house,the angles of depression of two ships on the opposite "],[" sides of it are observed to be "alpha" and "beta." If the height of the light house be h metre "],[" stand the line joining the ships passes through the foot of the light house,show "],[" that the distance between the ships is "(h(tan alpha+tan beta))/(tan alpha tan beta)" metres."]

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