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[" 14.Let "f(x)={[x^(3)+2x^(2),x in Q],[...

[" 14.Let "f(x)={[x^(3)+2x^(2),x in Q],[-x^(3)+2x^(2)+ax,x!in Q]" ,then the integral value of "a'so that "f(x)" is differentiable "],[x=1," is "]

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