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