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D( y )
2*y^2 = 0
2*y^2 = 0
2*y^2 = 0
2*y^2 = 0 // : 2
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
(4*y^6-(18*y^5))/(2*y^2) = 0
(4*y^6-18*y^5)/(2*y^2) = 0
4*y^6-18*y^5 = 0
2*y^5*(2*y-9) = 0
2*y-9 = 0 // + 9
2*y = 9 // : 2
y = 9/2
2*y^5*(y-9/2) = 0
(2*y^5*(y-9/2))/(2*y^2) = 0
( 2*y^5 )
2*y^5 = 0 // : 2
y^5 = 0
y = 0
( y-9/2 )
y-9/2 = 0 // + 9/2
y = 9/2
y in { 0}
y = 9/2
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