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D( x )
3.1416*x^2 = 0
3.1416*x^2 = 0
3.1416*x^2 = 0
3.1416*x^2 = 0 // : 3.1416
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
2 = 50/(3.1416*x^2) // - 50/(3.1416*x^2)
2-(50/(3.1416*x^2)) = 0
2-15.91545709*x^-2 = 0
-15.91545709*x^-2 = -2 // : -15.91545709
x^-2 = 0.125664
-2 < 0
1/(x^2) = 0.125664 // * x^2
1 = 0.125664*x^2 // : 0.125664
7.95772855 = x^2
x^2 = 7.95772855 // ^ 1/2
abs(x) = 7.95772855^(1/2)
x = 7.95772855^(1/2) or x = -7.95772855^(1/2)
x in { 7.95772855^(1/2), -7.95772855^(1/2) }
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