
If x is a point in between interval then ∫ a x f(t) dt will represent the area of the shaded region, which is A(x). Or in other words, A(x), i.e., ∫ a x f(t) dt is the area of the region bounded by the curve y = f(t) on t-axis with coordinates a and b. Here A(x) is known as the area function and it is helpful in finding the fundamental theorem of calculus. So, the area under the curve between a and x is the definite integral from a to x of f(t) dt, is Now, we must find the area under the curve y = f(t) between the interval. Now, let’s mark some point x between a and b on the graph. Let us consider a function f(t) continuous in the interval, as shown in the below image: In this article, we will be discussing the fundamental theorem of calculus which joins the two branches of calculus, but before that, we first need to understand the area function. For example, in determining the length of power cable required to connect the two substations.

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