e is an important constant, which occurs in nature. Euler worked a lot and did a lot on e.
Another expression of π is also pasted. This expression reaches to π quite efficiently and can be used in some graduation and post-graduation courses. Any help needed on inclusion in curricula will be obliged.
How do I make expressions? There are certain numbers and theories in me. There is a pattern in these. These patterns, I try to explain in mathematical expressions. As an example (-1) ^ (n+1) is actually talking of odds and evens. For when n is odd + sign is returned. And when n is even - sign is returned. So (-1)^(n+1) talks of odds and evens.