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D( x )
x = 0
x^-6*((3*x^4*y^-5)/9)*y^8 = 0
x = 0
x = 0
x^-6*((3*x^4*y^-5)/9)*y^8 = 0
x^-6*((3*x^4*y^-5)/9)*y^8 = 0
1/3*x^-2*y^3 = 0 // : 1/3*y^3
x^-2 = 0
x należy do O
x in (-oo:0) U (0:+oo)
(x^-6*((3*x^4*y^-5)/9)*y^8)^-3 = 0
27*x^6*y^-9 = 0 // : 27*y^-9
x^6 = 0
x = 0
x in { 0}
x belongs to the empty set
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