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D( y )
11*y^2 = 0
11*y^2 = 0
11*y^2 = 0
11*y^2 = 0 // : 11
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
9/(11*y^2)-((4/3)*y) = 0
(-4/3)*y+9/(11*y^2) = 0
9/11*y^-2-4/3*y = 0
y*(9/11*y^-3-4/3) = 0
9/11*y^-3 = 4/3 // : 9/11
y^-3 = 44/27
-3 < 0
1/(y^3) = 44/27 // * y^3
1 = 44/27*y^3 // : 44/27
27/44 = y^3
y^3 = 27/44 // ^ 1/3
y = (27/44)^(1/3)
y = 0
y = 0
y in { 0}
y = (27/44)^(1/3)
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