Question

How would you solve Cos^-1(-1)=3x to find all possible values of the angle 3x?

Answer 1

Well, \(\normalsize\color{black}{ \cos^{-1}(-1)=π }\) \(\LARGE\color{white}{ \rm │ }\)
So, \(\normalsize\color{black}{ 3x=π~~~~~~⇒~~~~x=π/3 }\) \(\LARGE\color{white}{ \rm │ }\)

Answer 2

So the first solution would be 60º

Answer 3

You can find it in other intervals, can't you ?

Answer 4

I'm really lost, sorry! How do we find it in other intervals? @SolomonZelman

Answer 5

You can find all co terminal angles.