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D( x )
x^1 = 0
x^1 = 0
x^1 = 0
x = 0
x in (-oo:0) U (0:+oo)
(5/(x^1))/2-((x^1)/2) = 0
(5/x)/2-(x/2) = 0
5/2*x^-1-1/2*x^1 = 0
(5/2*x^0-1/2*x^2)/(x^1) = 0 // * x^2
x^1*(5/2*x^0-1/2*x^2) = 0
x^1
(-1/2)*x^2+5/2 = 0
(-1/2)*x^2+5/2 = 0
DELTA = 0^2-(4*(-1/2)*(5/2))
DELTA = 5
DELTA > 0
x = (5^(1/2)+0)/(2*(-1/2)) or x = (0-5^(1/2))/(2*(-1/2))
x = -5^(1/2) or x = 5^(1/2)
x in { -5^(1/2), 5^(1/2)}
x in { -5^(1/2), 5^(1/2) }
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