Introduction

Abstract

Well this is an easy question to answer. Basically, Calculus has two parts: differential and integral. Differential Calculus is used for computing a function’s rate of change relative to one of its arguments. Generally, one begins with a function such as f(x), and as x changes, a corresponding change occurs in f(x). Differentiating f(x) with respect to x, produces a second function $f'(x)$, which gives the rate of change of f(x) for any x. For example, and without explaining why, if $f(x)=x^2$, then $f'(x)=2x$, and when $x=3$, f(x) is changing $2\times 3=6$ times faster than x. Which is rather neat!