This question was asked in Ex 9.1, 13
from the top of a lighthouse the angle of depression of two ships on opposite side of it they are observed to be 30 angle and 90 angle if the hight of the lighthouse is h meters and the line joining the ships passes through the foot of the lighthouse show that the distance between the ships is 4 upon root 3h metres 
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Gurjeet Singh Thind Singhe
Nov. 14, 2017, 6:57 p.m.