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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x^1)/4 = 64/x // - 64/x
(2*x^1)/4-(64/x) = 0
(2*x)/4-64*x^-1 = 0
1/2*x^1-64*x^-1 = 0
(1/2*x^2-64*x^0)/(x^1) = 0 // * x^2
x^1*(1/2*x^2-64*x^0) = 0
x^1
(1/2)*x^2-64 = 0
(1/2)*x^2-64 = 0
DELTA = 0^2-(-64*4*(1/2))
DELTA = 128
DELTA > 0
x = (128^(1/2)+0)/(2*(1/2)) or x = (0-128^(1/2))/(2*(1/2))
x = 8*2^(1/2) or x = -8*2^(1/2)
x in { -8*2^(1/2), 8*2^(1/2)}
x in { -8*2^(1/2), 8*2^(1/2) }
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