How do I find f(x) if I have this definition

for example i choosed x to be x=0.5:0.1:2;

I'm not entirely sure what needs to be instead of tree dots.

And how do I find f(x)

any suggestions?

Answer 1

[Jan]

You have given the formula already: Create a sum from n=1:m over:

(-1)^n * x^(2*n + 1) / factorial(2*n + 1)

These are all terms. Find a suitable number m such that the results are accurate.

how do I find f(x)

I don't know. There is no "f(x)" anywhere in your question.