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D( y )
y^2 = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
y^5-((y^3)/(y^2)) = 0
y^5-y = 0
y^5-y = 0
y*(y^4-1) = 0
1*y^4 = 1 // : 1
y^4 = 1
y^4 = 1 // ^ 1/4
abs(y) = 1
y = 1 or y = -1
y = 0
y = 0
y in { 0}
y in { 1, -1 }
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