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From the top of a lighthouse, the angles...

From the top of a lighthouse, the angles of depression of two ships on the opposite sides of it are observed to be a and p. If the height of the lighthouse is h m etres and the line joining the ships passes through the foot of the lighthouse, show that the distance betw een the ships is
`(h(tan alpha + tan beta))/(tan alpha tan beta)`

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The correct Answer is:
6.9 m
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