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Prove that
ƒ(x) =
is discontinuous at x=0
LHL:
=
= 1
RHL:
=
= -1
f(x) is discontinuous at x=0
1
is discontinuous at x=0
=
=
f(x) is discontinuous at x=0is discontinuous at x=0 = =f(x) is discontinuous at x=0