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D( x )
27*x^-9*y^12 = 0
x = 0
(27*x^-9*y^12)^-1 = 0
27*x^-9*y^12 = 0
27*x^-9*y^12 = 0
27*x^-9*y^12 = 0 // : 27*y^12
x^-9 = 0
x naleu017Cy do O
x = 0
x = 0
(27*x^-9*y^12)^-1 = 0
(27*x^-9*y^12)^-1 = 0
1/27*x^9*y^-12 = 0 // : 1/27*y^-12
x^9 = 0
x = 0
x in (-oo:0) U (0:+oo)
((((36*x^8*y^4)^1)/2)/((27*x^-9*y^12)^-1))/3 = 0
(((36*x^8*y^4)/2)/((27*x^-9*y^12)^-1))/3 = 0
162*x^-1*y^16 = 0 // : 162*y^16
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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