The function is
.
The points are
and
.
The instantaneous rate of change of the graph of
at the point
is the slope
of the tangent line at
given by
, provided the limit exists.
The slope at the point
is
.









.
The slope of the function
at
is
.
The slope at the point
is
.








.
The slope of the function
at
is
.
The slope of the function
at
is
.
The slope of the function
at
is
.