One of the most commonly used functions is the SUM function, which allows you to quickly add up values in a range of cells. To add all the values in all the cells from cell A1 to A10, it could be done with the SUM function in a formula like this:
=SUM(A1:A10)
That is much simpler than doing:
=A1+A2+A3+A4+A5+A6+A7+A8+A9+A10
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An infinite sum of continuous functions does not have to be continuous. For example, you should be able to construct a Fourier series that converges to a discontinuous function.
That's called a built-in function; or often simply a "function".
It is to convert a function into a sum of sine (or cosine) functions so as to simplify its analysis.
Use following function in any other cell to calculate sum: =sum(b4:b7)
int sum(n) { if (n==0) return 0; else return n+sum(n-1); }