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D( y )
3*y^7 = 0
(-4*y^4)/(3*y^7) = 0
3*y^7 = 0
3*y^7 = 0
3*y^7 = 0 // : 3
y^7 = 0
y = 0
(-4*y^4)/(3*y^7) = 0
(-4*y^4)/(3*y^7) = 0
-4/3*y^-3 = 0 // : -4/3
y^-3 = 0
y naleu017Cy do O
y in (-oo:0) U (0:+oo)
((-4*y^4)/(3*y^7))^-2 = 0
9/16*y^6 = 0 // : 9/16
y^6 = 0
y = 0
y in { 0}
y belongs to the empty set
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