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