Important Formulas (That You Probably Should Memorise) \(\frac{d}{dx}(a)=0\) \(\frac{d}{dx}(x)=1\) \(\frac{d}{dx}(ax)=a\) \(\frac{d}{dx}(x^{n})=nx^{n-1}\) \(\frac{d}{dx}(f(x)+f(g))=\frac{d}{dx}(f(x))+\frac{d}{dx}(g(x))\) \(f`(x)=\lim \limits_{h \to 0} \frac{f(x+h)-f(x)}{h}\)