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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(6*x)/(x^2)-(8*x)+12 = 0
(6*x)/(x^2)-8*x+12 = 0
6*x^-1-8*x^1+12*x^0 = 0
(12*x^1-8*x^2+6*x^0)/(x^1) = 0 // * x^2
x^1*(12*x^1-8*x^2+6*x^0) = 0
x^1
12*x-8*x^2+6 = 0
12*x-8*x^2+6 = 0
DELTA = 12^2-(-8*4*6)
DELTA = 336
DELTA > 0
x = (336^(1/2)-12)/(-8*2) or x = (-336^(1/2)-12)/(-8*2)
x = (4*21^(1/2)-12)/(-16) or x = (-4*21^(1/2)-12)/(-16)
x in { (4*21^(1/2)-12)/(-16), (-4*21^(1/2)-12)/(-16)}
x in { (4*21^(1/2)-12)/(-16), (-4*21^(1/2)-12)/(-16) }
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