&gt;and we&#x27;ll have to try to remember exactly why the integral of x^2 is x^3&#x2F;3 + constant. &#x2F;&#x2F;<p>I could never remember such things when I was younger (it&#x27;s worse now), which was why I loved maths so much because when I couldn&#x27;t remember - provided I could remember basic principles - I could work it out.<p>So as long as we know the basic principles of integration we won&#x27;t need to remember that particular sum.