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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)
2*w = s/(x^2) // - s/(x^2)
2*w-(s/(x^2)) = 0
-s*x^-2 = -(2*w) // : -s
x^-2 = 2*s^-1*w
-2 < 0
1/(x^2) = 2*s^-1*w // * x^2
1 = 2*s^-1*w*x^2 // : 2*s^-1*w
1/(2*s^-1*w) = x^2
x^2 = 1/(2*s^-1*w) // ^ 1/2
abs(x) = 1/(2^(1/2)*s^(-1/2)*w^(1/2))
x = 1/(2^(1/2)*s^(-1/2)*w^(1/2)) or x = -(1/(2^(1/2)*s^(-1/2)*w^(1/2)))
x in { 1/(2^(1/2)*s^(-1/2)*w^(1/2)), -(1/(2^(1/2)*s^(-1/2)*w^(1/2))) }
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