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[" 12.An observer in a boat finds that t...

[" 12.An observer in a boat finds that the angle of elevation of "],[" a tower standing on the top of a cliff is "00^(@)" and that of "],[" the top of cliff is "30^(@)" .If the height of the tower be "60m" ,"],[" then the height of the cliff is "],[[" (a) "30m," (b) "60sqrt(3)m],[" (c) "20sqrt(3)m," (d) None of these "]]

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