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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1.414/x)*x = 1.414 // - 1.414
(1.414/x)*x-1.414 = 0
0 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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