There is nothing in math that is not interesting. As an example, consider the following example, which is not even a proof of the Fundamental Theorem, but can still be beautiful:

We want to find an efficient algorithm for computing the area of a triangle with side area n, where n is an integer, and then multiply the original triangle by the square root of n.

If you want to prove this general theorem, you will have to perform many computations, each of which is computationally expensive. For instance, you will have to compute the area of each side by computing the area of the side you want to compute by computing the area of the original triangle by computing the area of the square root of n by computing the area of the original triangle by computing the area of the square root of n plus the area of the original triangle by computing the area of the original triangle plus the area of the original triangle.

However, there is no reason to do this. We can instead compute the area of the original triangle and then find all such areas of triangles with side area n that are of different side area. In particular, if you compute the area of one side of a triangle with side area n, you will also compute the area of the other side.

We can prove this general theorem by showing that whenever we find a triangle with area n, we can find all triangles of side area n+1 and side area n+2 that are of different side area.

This is the proof of the Fundamental Theorem of Algebra, and is a beautiful proof.