## Important Formulas (That You Probably Should Memorise)

• $$\frac{d}{dx}(a)=0$$
• $$\frac{d}{dx}(x)=1$$
• $$\frac{d}{dx}(ax)=a$$
• $$\frac{d}{dx}(x^{n})=nx^{n-1}$$
• $$\frac{d}{dx}(f(x)+f(g))=\frac{d}{dx}(f(x))+\frac{d}{dx}(g(x))$$
• $$f`(x)=\lim \limits_{h \to 0} \frac{f(x+h)-f(x)}{h}$$