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D( x )
x = 0
x^-5*y^4 = 0
(2*x^3*y^-3)/(x^-5*y^4) = 0
x = 0
x = 0
x^-5*y^4 = 0
x^-5*y^4 = 0
x^-5*y^4 = 0 // : y^4
x^-5 = 0
x naleu017Cy do O
(2*x^3*y^-3)/(x^-5*y^4) = 0
(2*x^3*y^-3)/(x^-5*y^4) = 0
2*x^8*y^-7 = 0 // : 2*y^-7
x^8 = 0
x = 0
x in (-oo:0) U (0:+oo)
((2*x^3*y^-3)/(x^-5*y^4))^-2 = 0
1/4*x^-16*y^14 = 0 // : 1/4*y^14
x^-16 = 0
x naleu017Cy do O
x belongs to the empty set
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