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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/y-((2/2)*y) = 0
3/y-y = 0
3*y^-1-1*y^1 = 0
(3*y^0-1*y^2)/(y^1) = 0 // * y^2
y^1*(3*y^0-1*y^2) = 0
y^1
3-y^2 = 0
3-y^2 = 0
DELTA = 0^2-(-1*3*4)
DELTA = 12
DELTA > 0
y = (12^(1/2)+0)/(-1*2) or y = (0-12^(1/2))/(-1*2)
y = -3^(1/2) or y = 3^(1/2)
y in { -3^(1/2), 3^(1/2)}
y in { -3^(1/2), 3^(1/2) }
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