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D( y )
y^2 = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
45/(y^2) = 5 // - 5
45/(y^2)-5 = 0
45*y^-2 = 5 // : 45
y^-2 = 1/9
-2 < 0
1/(y^2) = 1/9 // * y^2
1 = 1/9*y^2 // : 1/9
9 = y^2
y^2 = 9 // ^ 1/2
abs(y) = 3
y = 3 or y = -3
y in { 3, -3 }
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