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