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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
t = c-(x/x) // - c-(x/x)
t-c+x/x = 0
t-c+1 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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