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[" 72.If "x=at^(2)" and "y=2at" then "d^...

[" 72.If "x=at^(2)" and "y=2at" then "d^(2)y/dx^(2)" is "],[[" (a) "1/(2at^(3))," (b) "-1/(2at^(3))," (c) "2at^(3)]]

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