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D( x )
x^1 = 0
x^1 = 0
x^1 = 0
x = 0
x in (-oo:0) U (0:+oo)
x/24 = (72/(x^1))/2 // - (72/(x^1))/2
x/24-((72/(x^1))/2) = 0
x/24-36*x^-1 = 0
1/24*x^1-36*x^-1 = 0
(1/24*x^2-36*x^0)/(x^1) = 0 // * x^2
x^1*(1/24*x^2-36*x^0) = 0
x^1
(1/24)*x^2-36 = 0
(1/24)*x^2-36 = 0
DELTA = 0^2-(-36*4*(1/24))
DELTA = 6
DELTA > 0
x = (6^(1/2)+0)/(2*(1/24)) or x = (0-6^(1/2))/(2*(1/24))
x = 12*6^(1/2) or x = 12*6^(1/2)
x in { 12*6^(1/2), 12*6^(1/2)}
x in { 12*6^(1/2), 12*6^(1/2) }
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