Question

HELP ME HERE PLS!!!

Answer 1

All maxima will be when costheta = 1, so it will be |9+18|. Minima will be |9|. Remember the trig circle for the signs. And remember that cos 2pi/3 = -1/2

Answer 2

I.e., the first is decreasing from 27 to 18. The second is decreasing from 9 to 9 +18*(-1/2) = 9-9 = 0

Answer 3

From 0 to -9. And so on.

Answer 4

Ok, thank you)