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D( x )
x = 0
x^-4*((2*x^6*y^-5)/5)*y^3 = 0
x = 0
x = 0
x^-4*((2*x^6*y^-5)/5)*y^3 = 0
x^-4*((2*x^6*y^-5)/5)*y^3 = 0
2/5*x^2*y^-2 = 0 // : 2/5*y^-2
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(x^-4*((2*x^6*y^-5)/5)*y^3)^-2 = 0
25/4*x^-4*y^4 = 0 // : 25/4*y^4
x^-4 = 0
x należy do O
x belongs to the empty set
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