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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)
(5*y^5-(6*y^4))/(y^2) = 0
(5*y^5-6*y^4)/(y^2) = 0
5*y^5-6*y^4 = 0
y^4*(5*y-6) = 0
5*y-6 = 0 // + 6
5*y = 6 // : 5
y = 6/5
y^4*(y-6/5) = 0
(y^4*(y-6/5))/(y^2) = 0
( y-6/5 )
y-6/5 = 0 // + 6/5
y = 6/5
( y^4 )
1*y^4 = 0 // : 1
y^4 = 0
y = 0
y in { 0}
y = 6/5
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