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D( y )
6*y = 0
6*y = 0
6*y = 0
6*y = 0 // : 6
y = 0
y in (-oo:0) U (0:+oo)
(2*(18*y^2)^(1/3))/(6*y) = 0
((1*18^(1/3))/3)*y^(-1/3) = 0 // : (1*18^(1/3))/3
y^(-1/3) = 0
y naleu017Cy do O
y belongs to the empty set
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