The concept of limits has to do with the behaviour of the function close to x = a and not at x = a.
x→alimf(x) may exist even if function f is undefined at x=a
f(x)=x,x=0 x→0limf(x)=0, f is undefined at x=0.
x→alimf(x) may be equal infinity even if function f is undefined at x=a
f(x)=∣x∣1, x→0limf(x)=∞, f is undefined at x=0.
x→alimf(x) may not exist if function f is undefined at x=a
f(x)=x1,
x→0−limf(x)=−∞,x→0+limf(x)=∞,
x→0limf(x)=does not exist
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