4. (5 points) Let f(x) = sin(x2) + cosx. The graph of y = If(5)(x)| is shown below. 120 80 Graph of y = |15) (x)| Let PA(x) be the fourth-degree Taylor polynomial for f(x) about x = 0. Using information from the graph of y = [f()(x) | shown above, show that 5. (5 points) Evaluate cost dx as an infinite series