task in python. How to parse the formula?

Question

Python

There is a task:
The user enters a real number хand precision precision. Write a program that хcalculates the sum of a series given a number up to precision.

The exponentiation operation and the function factorialcannot be used.

Example:

Введите точность: 0.001
Введите x: 5
Сумма ряда =  0.2836250150891709

With writing code, I think I can handle it. But I can’t understand the formula, namely the part after the equal sign. I would be grateful for a simple explanation of this formula.

Answer 1

Now read about rows .