Hey! Can someone help me with my math homework? Its only the red part! Thank you so much! :)

If 1 km = 0.621 miles, how many miles are in a centimeter

(a) compute the maclaurin polynomial m2(x) for f(x) = cos x. (b) use the polynomial of part (a) to estimate cos π 12. (c) use a calculator to compute the error made using the estimate from part (b) for the value of cos π 12. remember that the error is defined to be the absolute value of the difference between the true value and the estimate.

How do i do this activity, is appreciated