[" If "y=at^(2),x=2at," where "a" is a c...

[" If "y=at^(2),x=2at," where "a" is a constant,then "(d^(2)y)/(dx^(2))" at "x=(1)/(2)" is "],[[" (a) "(1)/(2a)," (b) "1],[" (c) "2a," (d) none of these "]]

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