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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 10/x // - 10/x
y-(10/x) = 0
y-10*x^-1 = 0
-10*x^-1 = -y // : -10
x^-1 = y/10
-1 < 0
1/(x^1) = y/10 // * x^1
1 = x^1*(y/10) // : y/10
10*y^-1 = x^1
x = 10*y^-1
x = 10*y^-1
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