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D( x )
2*x^2*y^5 = 0
(2*x^2*y^3)^3 = 0
2*x^2*y^5 = 0
2*x^2*y^5 = 0
2*x^2*y^5 = 0 // : 2*y^5
x^2 = 0
x = 0
(2*x^2*y^3)^3 = 0
(2*x^2*y^3)^3 = 0
8*x^6*y^9 = 0 // : 8*y^9
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
((2*x^2*y^5)^-1)/((2*x^2*y^3)^3) = 0
1/16*x^-8*y^-14 = 0 // : 1/16*y^-14
x^-8 = 0
x należy do O
x belongs to the empty set
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