Normally when we deal with integrals, we integrate something like f(x)dx, where dx represents a small increment in x. It’s basically infinitesimally small. Now what about d(x²)? How can we solve today’s integral?
Generally speaking, if y = f(x), then dy = f’(x)dx
Here’s a hint: read the line above again …
I recommend you to pause the article, grab your pen and paper, and give this a go. When you are ready, keep reading for the solution!