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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = 20.16/x // - 20.16/x
y-(20.16/x) = 0
y-20.16*x^-1 = 0
-20.16*x^-1 = -y // : -20.16
x^-1 = 0.04960317*y
-1 < 0
1/(x^1) = 0.04960317*y // * x^1
1 = 0.04960317*x^1*y // : 0.04960317*y
20.16000187*y^-1 = x^1
x = 20.16000187*y^-1
x = 20.16000187*y^-1
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