Question

I need some trig help please!

Answer 1

\[\cos(3\theta)=-1\]

Answer 2

what's the question?

Answer 3

To find the solution set

Answer 4

2/3 pi

Answer 5

On the interval 0 to 2pi

Answer 6

If it was \(\large\rm \cos(\theta)=-1\) would you know how to find the solution set for theta? :)

Answer 7

I would look at a unit circle or do arrcos in the calculator?

Answer 8

Cos is =1 at pi

Answer 9

sin(pi) = 1

Answer 10

Sure :) you could look at a unit circle.
cosine is -1 at pi, yes.