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