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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X^2-(x/x)-1 = 3 // - 3
X^2-(x/x)-3-1 = 0
X^2-3-1-1 = 0
X^2-5 = 0
x należy do R
x in (-oo:0) U (0:+oo)
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