I need to find the missing angle of this triangle or whatever it is

(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.

Which is the graph of f(x) = (4)x? image for option 1 image for option 2 image for option 3 image for option 4

Determine which expressions represent real numbers and which expressions represent complex number. asaaap! plis!