# Differentials

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