Expansion by maclurins and Taylor's series
Hello Shivani,
The following link might help solve your problem -
https://www3.nd.edu/~aache/Files/taylor.pdf
https://www.khanacademy.org/math/ap-calculus-bc/bc-series-new/bc-10-11/v/maclaurin-and-taylor-series-intuition
https://www.youtube.com/watch?v=cjPoEZ0I5wQ&vl=en
Hope this helps.