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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
95 = 6.28*r*(1/x) // - 6.28*r*(1/x)
95-(6.28*r*(1/x)) = 0
95-6.28*r*x^-1 = 0
-6.28*r*x^-1 = -95 // : -6.28*r
x^-1 = 15.12738854*r^-1
-1 < 0
1/(x^1) = 15.12738854*r^-1 // * x^1
1 = 15.12738854*r^-1*x^1 // : 15.12738854*r^-1
0.06610526*r = x^1
x = 0.06610526*r
x = 0.06610526*r
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