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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(y^5)/y-4 = 0
1*y^4 = 4 // : 1
y^4 = 4
y^4 = 4 // ^ 1/4
abs(y) = 4^(1/4)
y = 4^(1/4) or y = -4^(1/4)
y in { 4^(1/4), -4^(1/4) }
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