7. (10 points) Let f(x)=sin(x) + cos x. The graph of f(x)| is shown below. -00 50- 40 30 20 10 -0.0 (a) Find P(x), the 4th degree Maclaurin polynomial of f(x) and use this to estimate f(0.4). 1 (b) Use the given graph to show that the error in the approximation obtained in part a) is less than 200