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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
Y = x/x-2 // - x/x-2
Y-(x/x)+2 = 0
Y-1+2 = 0
Y+1 = 0
x naleu017Cy do R
x in (-oo:0) U (0:+oo)
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