Question

cos 180 = cos 30x

Answer 1

What is the only angle between 0 and 2pi whose cosine is -1?

Answer 2

Right, we'll use degrees in this one.
So, cos(180) = cos(3x); do you see now?

Answer 3

Ok as in you do see, or ok as in this guy makes no sense?

Answer 4

No, we're solving for x.
cos(180) = cos(3x); shouldn't both of the angle be at the same? hmmmm

Answer 5

Hmm ok as you know how to solve for x or Idk what you're talking bout ok?

Answer 6

Almost. We can leave out the cos considering we're just solving for x, which is part of the argument.
So, we need both of the angle to equal each other.

Answer 7

Right, cos(180) = cos(3x); 3x should 180 degrees, right?

Answer 8

So....
180 = 3x

Answer 9

Yup.

Answer 10

;)

Answer 11

sorry it was actually over 30 :/