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