" <mfenced="" open="{" close="" >="" <mtable>="" <mtr>="" <mtd>="" <mfrac>="" <mmultiscripts>="" x="" <="" mtext>="" <none="" 2="" mmultiscripts>="" -1="" mrow>="" x-1="" mfrac>="" mtd>="" si="" x≠1="" mtr>="" 3="" mtable>="" mfenced>="" math>,="" les="" funcions="" polinòmiques="" exponencials="" logarÃtmiques="" la="" funció="" sinus="" cosinus,="" contÃnua,="" <math="" xmlns="http://www.w3.org/1998/Math/MathML" 1)="" ∃="" <munderover>="" lim="" x→a="" munderover>="" ∈="" â„œ="" 2)="" f(a)="" 3)="" x→="" a="" +="" i ="" -="" i="" l≠m="" discontinuïtat="" de="" salt="" f(x)≠f(a)="" e="" x≤0="" lnx="" x>0="" 2x="" x≤1="" x-3="" x>1="" discontÃnua,="" una="" en="" un="" punt,="" 1="" x-2="" i="" l≠f(a)="" evitable="" limf(x)="±∞" o ="" ="" asimptòtica="" math>"="">