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Let a and b respectively be the points o...

Let a and b respectively be the points of local maximum and local minimum of the function
`f (x) = 2x^3 - 3x^2 - 12x.`
If A is the total area of the region bounded by y = f (x), the x-axis and the lines x = a and x = b, then 4 A is equal to __________.

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