HELPP MEE PLSS, I CANT SEEM TO FIGURE IT OUT.

Express the following as a function of a single angle, cos(60) cos(-20) - sin(60) sin(-20)

What is the domain and range of each function 1. x (3, 5, 7, 8, 11) y ( 6, 7, 7, 9, 14) 2. x (-3, -1, 2, 5, 7) y (9, 5, 4, -5, -7)

Secant ac and bd intersect at point e inside f what is the measure of aed if measurements cd equals 30 a b is 50 and cb is 170