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D( x )
16*x^2*y^3 = 0
16*x^2*y^3 = 0
16*x^2*y^3 = 0
16*x^2*y^3 = 0 // : 16*y^3
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^3*y^5)/(16*x^2*y^3) = 0
1/16*x*y^2 = 0 // : 1/16*y^2
x = 0
x in { 0}
x belongs to the empty set
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