<p>Well,i did have calculus. But the way I saw it, I thought it was just another branch of math which consists of some relatively easy formulas! Back then I didn’t need to bother with the basic behind those formulas, just used it for calculation of differentiation and integration. Few months ago I actually understood that calculus is needed to measure the slope/tangent line of a curve line . We can easily measure the slope of a straight line but we need calculus to find the slope for curve line.And it also has lots of other uses. And I was really happy when I realized this concept.So I guess I’m waiting for more discoveries!</p>