f(x)=x(x^2-x-6)=x(x-3)(x+2) วาดกราฟครับ
พทใต้กราฟ $\mid \int_{-2}^{0} f(x) dx \mid + \mid \int_{0}^{3} f(x) dx \mid =\frac{16+64}{3}$
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