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D( y )
-5*y^2 = 0
-5*y^2 = 0
-5*y^2 = 0
-5*y^2 = 0 // : -5
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
(-3*y^2)/(-5*y^2) = 0
3/5 = 0
y belongs to the empty set
y belongs to the empty set
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