What’s the answer I don’t know how to solve it and I tried everything?

(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.

The value of the expression 16-^3/4 8 1/8 -6 6 1/40 1/64

y=2x−1 5x−4y=1 is (1,1)(1,1) a solution of the system?