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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
((3*y)/6)*y-((2*y)/y)-12+2 = 0
((3*y)/6)*y-12-2+2 = 0
1/2*y^2 = 12 // : 1/2
y^2 = 24
y^2 = 24 // ^ 1/2
abs(y) = 2*6^(1/2)
y = 2*6^(1/2) or y = -(2*6^(1/2))
y in { 2*6^(1/2), -(2*6^(1/2)) }
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