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D( y )
9*y^2-4 = 0
9*y^2-4 = 0
9*y^2-4 = 0
9*y^2 = 4 // : 9
y^2 = 4/9
y^2 = 4/9 // ^ 1/2
abs(y) = 2/3
y = 2/3 or y = -2/3
y in (-oo:-2/3) U (-2/3:2/3) U (2/3:+oo)
(3*y+2)/(9*y^2-4) = 0
3*y+2 = 0 // - 2
3*y = -2 // : 3
y = -2/3
y in { -2/3}
y belongs to the empty set
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