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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
-y = -6/y // + -6/y
-y-(-6/y) = 0
6*y^-1-y = 0
6*y^-1-1*y^1 = 0
(6*y^0-1*y^2)/(y^1) = 0 // * y^2
y^1*(6*y^0-1*y^2) = 0
y^1
6-y^2 = 0
6-y^2 = 0
DELTA = 0^2-(-1*4*6)
DELTA = 24
DELTA > 0
y = (24^(1/2)+0)/(-1*2) or y = (0-24^(1/2))/(-1*2)
y = -6^(1/2) or y = 6^(1/2)
y in { -6^(1/2), 6^(1/2)}
y in { -6^(1/2), 6^(1/2) }
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