Question: how to find rhl and lhl?
Answer: Method for finding L.H.L. and R.H.L. (i) For finding right hand limit (R.H.L.) of the function at x=a, we write x + h in place of x, while for left hand limit (L.H.L) we write x - h in place of x. (ii) Then we replace x by 'a' in the functions so obtained.