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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(1/x)-3 = x-(2/x)-3 // - x-(2/x)-3
1/x-x-(1/x)+2/x-3+3 = 0
1/x-x-x^-1+2/x-3+3 = 0
2*x^-1-1*x^1 = 0
(2*x^0-1*x^2)/(x^1) = 0 // * x^2
x^1*(2*x^0-1*x^2) = 0
x^1
2-x^2 = 0
2-x^2 = 0
DELTA = 0^2-(-1*2*4)
DELTA = 8
DELTA > 0
x = (8^(1/2)+0)/(-1*2) or x = (0-8^(1/2))/(-1*2)
x = -2^(1/2) or x = 2^(1/2)
x in { -2^(1/2), 2^(1/2)}
x in { -2^(1/2), 2^(1/2) }
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