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Let f(x)={(x^3+2x^2,x in Q),(-x^3+2x^2+a...

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 at `x=1` is

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