Question

How do you solve `3 cos theta = 2`?

Answer 1

You need to isolate `cos \theta`, then take the arccosine (the cosine backwards) of both sides

Explanation:

`3cos \theta =2`
`cos \theta =2/3`
`arccos (cos \theta) =arccos( 2/3)`
`( \theta) =arccos( 2/3)=48.2^{ o}` or 0.841 radians