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D( y )
33*y^8 = 0
33*y^8 = 0
33*y^8 = 0
33*y^8 = 0 // : 33
y^8 = 0
y = 0
y in (-oo:0) U (0:+oo)
(-11*y^12)/(33*y^8) = 0
-1/3*y^4 = 0 // : -1/3
y^4 = 0
y = 0
y in { 0}
y belongs to the empty set
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