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D( y )
y = 0
y^2 = 0
y = 0
y = 0
y^2 = 0
y^2 = 0
1*y^2 = 0 // : 1
y^2 = 0
y = 0
y in (-oo:0) U (0:+oo)
1-(2/y) = 3/(y^2) // - 3/(y^2)
1-(2/y)-(3/(y^2)) = 0
1-2*y^-1-3*y^-2 = 0
t_1 = y^-1
1-3*t_1^2-2*t_1^1 = 0
1-3*t_1^2-2*t_1 = 0
DELTA = (-2)^2-(-3*1*4)
DELTA = 16
DELTA > 0
t_1 = (16^(1/2)+2)/(-3*2) or t_1 = (2-16^(1/2))/(-3*2)
t_1 = -1 or t_1 = 1/3
t_1 = -1
y^-1+1 = 0
1*y^-1 = -1 // : 1
y^-1 = -1
-1 < 0
1/(y^1) = -1 // * y^1
1 = -1*y^1 // : -1
-1 = y^1
y = -1
t_1 = 1/3
y^-1-1/3 = 0
1*y^-1 = 1/3 // : 1
y^-1 = 1/3
-1 < 0
1/(y^1) = 1/3 // * y^1
1 = 1/3*y^1 // : 1/3
3 = y^1
y = 3
y in { -1, 3 }
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