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D( y )
(15*(y^3)^1)/2 = 0
(15*(y^3)^1)/2 = 0
(15*(y^3)^1)/2 = 0
(15*y^3)/2 = 0
15/2*y^3 = 0 // : 15/2
y^3 = 0
y = 0
y in (-oo:0) U (0:+oo)
12*((5*y^2)/((15*(y^3)^1)/2))*((y^5)/2) = 0
12*((5*y^2)/((15*y^3)/2))*((y^5)/2) = 0
4*y^4 = 0 // : 4
y^4 = 0
y = 0
y in { 0}
y belongs to the empty set
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