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The maximum value of the function `f(x)=2x^(3)-15x^(2)+36x-48` on the set `a={x|x^(2)+20le9x}` is

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The maximum value of the function f(x)=2x^(3)-15x^(2)+36x-48 on the set A={x|x^(2)|20<=9x} is

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