Question

How do you solve `cos3x=1/sqrt2`?

Answer 1

So as our `3` is next to the `x` and not the `cos`, we need to divide by `3` right at the end. First step is `cos^(-1)`.
`cos^(-1)( 1/sqrt2) = 45`
`45/3 = 15`.
If the questions asks about limits and says something along the lines of 'between `0` and `360`', you'll need to find several others answers along with the `45` before you divide by `3`.