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D( x )
(2*x^3*y^2)/((-x)^2*y^5) = 0
(-x)^2*y^5 = 0
(2*x^3*y^2)/((-x)^2*y^5) = 0
(2*x^3*y^2)/((-x)^2*y^5) = 0
2*x*y^-3 = 0 // : 2*y^-3
x = 0
(-x)^2*y^5 = 0
(-x)^2*y^5 = 0
x^2*y^5 = 0 // : y^5
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
((2*x^3*y^2)/((-x)^2*y^5))^-2 = 0
1/4*x^-2*y^6 = 0 // : 1/4*y^6
x^-2 = 0
x naleu017Cy do O
x belongs to the empty set
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