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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)
H = 320/(x^2) // - 320/(x^2)
H-(320/(x^2)) = 0
H-320*x^-2 = 0
-320*x^-2 = -H // : -320
x^-2 = H/320
-2 < 0
1/(x^2) = H/320 // * x^2
1 = (H/320)*x^2 // : H/320
320*H^-1 = x^2
x^2 = 320*H^-1 // ^ 1/2
abs(x) = 8*5^(1/2)*H^(-1/2)
x = 8*5^(1/2)*H^(-1/2) or x = -(8*5^(1/2)*H^(-1/2))
x in { 8*5^(1/2)*H^(-1/2), -(8*5^(1/2)*H^(-1/2)) }
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