A square<span> is a special kind of </span><span>rectangle (4 sides) so therefore it is always a rectangle.</span>
Take
, so that
, and you have
Integrate by parts, setting
and
, which give
and
. Then
which in terms of
is
where the last term uses the property that
, and the
term is absorbed into
.
Given the function f(x);
Evaluating the function f(x+h);
So;
Evaluating the second function;
simplifying further;
Therefore, we have;