What is the scale factor of this dilation?

(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.

Me because some of question i don’t understand

The measurement of one angle of a right triangle is 42° what is the measurement of the third angle? (there is no picture)