f`(x)=(3x^2(x^2-4)-(x^3-8)*2x)/(x^2-4)^2
f`(0)=0
g`(x)=8/3*3x^2-2x/2=8x^2-x
8x^2-x=0
x(8x-1)=0
x1=0; x2=1/8
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f`(x)=(3x^2(x^2-4)-(x^3-8)*2x)/(x^2-4)^2
f`(0)=0
g`(x)=8/3*3x^2-2x/2=8x^2-x
8x^2-x=0
x(8x-1)=0
x1=0; x2=1/8