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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = x-((x^2)/x)-2 // - x-((x^2)/x)-2
(x^2)/x-x+y+2 = 0
y+2 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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