Q.

The right hand limit of the function   f(x)=|x−4|x−4,    x≠40,    x=4at x = 4, is

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a

1

b

-1

c

0

d

non-existent

answer is A.

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Detailed Solution

We have, (RHL of f(x) at x=4 ) =limx→4+ f(x)=limh→0 f(4+h)=limh→0 |4+h−4|4+h−4=limh→0 |h|h=limh→0 hh=limh→0 1=1.
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