Q4 Let f(a) = cos(x2). It turns out that there is no nice anti-derivative of f. However, you want to get a sense for / cos(x2) dx. a 6 points Do an Lz approximation of / cos(x?) dx. It is okay for your answer to include sine and/ or cosine. b 10 points How large would n need to be to guarantee that a In approximation is within 100 of the actual value