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D( x )
x = 0
-x = 0
(y^0*(-x)^-5)^3 = 0
x = 0
x = 0
-x = 0
x = 0
(y^0*(-x)^-5)^3 = 0
(y^0*(-x)^-5)^3 = 0
((-x)^-5)^3 = 0
-1*x^-15 = 0 // : -1
x^-15 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
(2*2*x^-1*x)/((y^0*(-x)^-5)^3) = 0
(2*2*x^-1*x)/(((-x)^-5)^3) = 0
-4*x^15 = 0 // : -4
x^15 = 0
x = 0
x in { 0}
x belongs to the empty set
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