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D( x )
(9/16)*x^5*y^12 = 0
x^2 = 0
(9/16)*x^5*y^12 = 0
(9/16)*x^5*y^12 = 0
9/16*x^5*y^12 = 0 // : 9/16*y^12
x^5 = 0
x = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
((3*y^4)/(x^2))/((9/16)*x^5*y^12) = 0
16/3*x^-7*y^-8 = 0 // : 16/3*y^-8
x^-7 = 0
x naleu017Cy do O
x belongs to the empty set
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