- Take
and
; then we have
and

hence the computation of the limit at of shows an undeterminate case. We have:

whence

- Take
and
; then we have
and

Here we have

whence

Note that we have here an example of what is explained in subsection 5.1. For the difference of two square roots, see subsection 5.3.

Noah Dana-Picard 2007-12-28