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D( y )
y = 0
(3*y^-2)^3 = 0
y = 0
y = 0
(3*y^-2)^3 = 0
(3*y^-2)^3 = 0
27*y^-6 = 0 // : 27
y^-6 = 0
y naleu017Cy do O
y in (-oo:0) U (0:+oo)
(y^0*y^-4*y^-3)/((3*y^-2)^3) = 0
(y^-4*y^-3)/((3*y^-2)^3) = 0
1/27*y^-1 = 0 // : 1/27
y^-1 = 0
y naleu017Cy do O
y belongs to the empty set
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