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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/h+1/s = 1/x // - 1/x
1/h+1/s-(1/x) = 0
1/h+1/s-x^-1 = 0
-1*x^-1 = -(h^-1+s^-1) // : -1
x^-1 = h^-1+s^-1
-1 < 0
1/(x^1) = h^-1+s^-1 // * x^1
1 = x^1*(h^-1+s^-1) // : h^-1+s^-1
1/(h^-1+s^-1) = x^1
x = 1/(h^-1+s^-1)
x = 1/(h^-1+s^-1)
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