Approximating even functions by powers of cosine
John
A couple days ago I wrote a post about turning a trick into a technique, finding another use for a clever way to construct simple, accurate approximations. I used as my example approximating the Bessel function J(x) with (1 + cos(x))/2. I learned via a helpful comment on Mathstodon that my approximation was the first-order […] The post Approximating even functions by powers of cosine first appeared on John D. Cook .