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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*x^3)/x-(2*x^2)+4*x-3+2 = 0
(4*x^3)/x-2*x^2+4*x-3+2 = 0
2*x^2+4*x-1 = 0
DELTA = 4^2-(-1*2*4)
DELTA = 24
DELTA > 0
x = (24^(1/2)-4)/(2*2) or x = (-24^(1/2)-4)/(2*2)
x = (2*6^(1/2)-4)/4 or x = (-2*6^(1/2)-4)/4
x in { (-2*6^(1/2)-4)/4, (2*6^(1/2)-4)/4 }
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