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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
y = (2*x)/x-1 // - (2*x)/x-1
y-((2*x)/x)+1 = 0
y-2+1 = 0
y-1 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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