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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
32/x = x/2 // - x/2
32/x-(x/2) = 0
32*x^-1-1/2*x^1 = 0
(32*x^0-1/2*x^2)/(x^1) = 0 // * x^2
x^1*(32*x^0-1/2*x^2) = 0
x^1
(-1/2)*x^2+32 = 0
(-1/2)*x^2+32 = 0
DELTA = 0^2-(4*32*(-1/2))
DELTA = 64
DELTA > 0
x = (64^(1/2)+0)/(2*(-1/2)) or x = (0-64^(1/2))/(2*(-1/2))
x = -8 or x = 8
x in { -8, 8}
x in { -8, 8 }
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