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D( x )
x = 0
1/x = 0
x = 0
x = 0
1/x = 0
1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
1/(1/x) = a // - a
1/(1/x)-a = 0
x-a = 0 // + a
x = a
x = a
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