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D( y )
y^4 < 0
y^4 < 0
y^4 < 0
1*y^4 < 0
1*y^4 < 0 // : 1
y^4 < 0/1
y^4 < 0
y belongs to the empty set
y in (-oo:+oo)
(y^4)^(5/8) = 0
1*y^(5/2) = 0 // : 1
y^(5/2) = 0
y = 0
y = 0
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