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[" 18Let Cbe the curve "y=x^(3)" (where ...

[" 18Let Cbe the curve "y=x^(3)" (where "x" takes all real values).The tangent at Ameets the curve again at "B" .If "],[" the gradient at "B" is "K" times the gradient at "A" then "K" is equal to "],[[" (A) "4," (B) "2," (C) "-2," (D) "(1)/(4)]]

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