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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 0.1/x // - 0.1/x
y-(0.1/x) = 0
y-0.1*x^-1 = 0
-0.1*x^-1 = -y // : -0.1
x^-1 = 10*y
-1 < 0
1/(x^1) = 10*y // * x^1
1 = 10*x^1*y // : 10*y
1/(10*y) = x^1
x = 1/(10*y)
x = 1/(10*y)
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