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f''(x) = (9x - 2x^3)"
f"(x) = (9 - 6x^2)'
f"(x) = -12x = 0
x=0
x=0 es un punto de inflexión.
Entonces:
f(0)=9(0)-2(0)^3
f(0)=0
Por lo tanto el punto de inflexión: (0,0).