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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10 = (10*x)/x // - (10*x)/x
10-((10*x)/x) = 0
10-10 = 0
0 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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