<p>Is Leinbiz rule need for calc ab?</p>
<p>You mean [url=<a href=“http://en.wikipedia.org/wiki/Leibniz_integral_rule]this[/url”>Leibniz integral rule - Wikipedia]this[/url</a>]? It seems to involve partial derivatives, so no. I’m in multivariable and I haven’t heard of it in school anywhere, at least not by that name. </p>