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D( x )
x^3*((5*x^-4*y^8)/10)*y^-6 = 0
x = 0
x^3*((5*x^-4*y^8)/10)*y^-6 = 0
x^3*((5*x^-4*y^8)/10)*y^-6 = 0
1/2*x^-1*y^2 = 0 // : 1/2*y^2
x^-1 = 0
x należy do O
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^3*((5*x^-4*y^8)/10)*y^-6)^-3 = 0
8*x^3*y^-6 = 0 // : 8*y^-6
x^3 = 0
x = 0
x in { 0}
x belongs to the empty set
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