As we have learned
Right hand limit -
The right hand limit of f(x) as 'x' tends to 'a' exists and is equal to l1 if as 'x' approaches 'a' through values greater than 'a'.
where a+ means a+h & h → 0 therefore f(a+h)
We know , sgn (x) =
In sgn (x) , since so its limit will be 1
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