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D( x )
a^2*b^4*((8*x^3*y^2)/4) = 0
a^2*b^4*((8*x^3*y^2)/4) = 0
a^2*b^4*((8*x^3*y^2)/4) = 0
2*a^2*b^4*x^3*y^2 = 0 // : 2*a^2*b^4*y^2
x^3 = 0
x = 0
x in (-oo:0) U (0:+oo)
(a^2*b^4*((8*x^3*y^2)/4))^-2 = 0
1/4*a^-4*b^-8*x^-6*y^-4 = 0 // : 1/4*a^-4*b^-8*y^-4
x^-6 = 0
x należy do O
x belongs to the empty set
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