f(x) = 0.2·x·(x^2 - 4) = 0.2·x^3 - 0.8·x
F(x) = 0.05·x^4 - 0.4·x^2
∫ (-3 bis -2) f(x) dx = F(-2) - F(-3) = -1.25
∫ (-2 bis 0) f(x) dx = F(0) - F(-2) = 0.8
∫ (0 bis 2) f(x) dx = F(2) - F(0) = -0.8
∫ (2 bis 3) f(x) dx = F(3) - F(2) = 1.25
A = 1.25 + 0.8 + 0.8 + 1.25 = 4.1 FE