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Y in (-oo:+oo)
(Y^3)/4 = -4*Y // + -4*Y
(Y^3)/4-(-4*Y) = 0
(Y^3)/4+4*Y = 0
1/4*Y^3+4*Y = 0
Y*(1/4*Y^2+4) = 0
1/4*Y^2 = -4 // : 1/4
Y^2 = -16
Y = 0
Y = 0
Y = 0
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