Sin & cos of a number without library

Answer 1

Why would you not just use a library?
When you want to do it without a library, then it is simply just math. It's the same for every language.

First result by searching for "Calculate sine manually"
Read this if you want to know how.

https://www.quora.com/How-do-I-calculate-cos-sine-etc-without-a-calculator

Please try to research a little on your own before asking here. Of course we will help you when you still have problems.

Answer 2

Founded an solution alread but thanks

Here is why : my tracher told me not to use library yet because i need to understand how are those librarys made...not just use them