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D( x )
16*x^9*y^20 = 0
16*x^9*y^20 = 0
16*x^9*y^20 = 0
16*x^9*y^20 = 0 // : 16*y^20
x^9 = 0
x = 0
x in (-oo:0) U (0:+oo)
((32*x^18*y^10)/(16*x^9*y^20))^2 = 0
4*x^18*y^-20 = 0 // : 4*y^-20
x^18 = 0
x = 0
x in { 0}
x belongs to the empty set
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