Revision as of 04:47, 20 March 2015 by Tom(talk | contribs)(Created page with "<div class="toccolours mw-collapsible mw-collapsed"> <strong>Proposition:</strong> $\dfrac{d}{dx}\cos(x) = -\sin(x)$ <div class="mw-collapsible-content"> <strong>Proof:</stron...")
