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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
p^2-1 = 8/x // - 8/x
p^2-(8/x)-1 = 0
p^2-8*x^-1-1 = 0
-8*x^-1 = -(p^2-1) // : -8
x^-1 = (1-p^2)/(-8)
-1 < 0
1/(x^1) = (1-p^2)/(-8) // * x^1
1 = x^1*((1-p^2)/(-8)) // : (1-p^2)/(-8)
-8*(1-p^2)^-1 = x^1
x = -8*(1-p^2)^-1
x = -8*(1-p^2)^-1
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