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D( x )
((3*x^-8)/5)*y^3 = 0
x = 0
((3*x^-8)/5)*y^3 = 0
((3*x^-8)/5)*y^3 = 0
3/5*x^-8*y^3 = 0 // : 3/5*y^3
x^-8 = 0
x naleu017Cy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(((3*x^-8)/5)*y^3)^-2 = 0
25/9*x^16*y^-6 = 0 // : 25/9*y^-6
x^16 = 0
x = 0
x in { 0}
x belongs to the empty set
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