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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
((15*24*y^-4*y^10)/6)*y^7 = 0
60*y^13 = 0 // : 60
y^13 = 0
y = 0
y in { 0}
y belongs to the empty set
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