Calculating the rate with which an automobile is changing its speed seems easy until we are taking standard units. But, what if we want to find the change for an extremely shorter duration, say 1/100th of a second? Or for an even shorter infinitesimally small instant? It definitely seems impossible but thanks to calculus theory and it’s tools which make it possible to obtain a precise estimation. And the application of these mathematical implements is what we’re going to learn about in here. Let’s begin!