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D( x )
-x = 0
(-x)^-1*y = 0
-x = 0
x = 0
(-x)^-1*y = 0
(-x)^-1*y = 0
x^-1*(-y) = 0 // : -y
x^-1 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
((((-x)^-1*y)^0)/4)*w^-1*y^2 = 0
(1/4)*w^-1*y^2 = 0
1/4*w^-1*y^2 = 0
x naleu017Cy do R
x in (-oo:0) U (0:+oo)
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