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