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## Homework Statement

My problem from before has been more or less resolved, but now I have a new, bigger problem. I need to figure out how to find recuring values for trig functions. I'm having a hard time figuring out how to

1. Get the equations associated with a given value for the trig functions

2. Actually finding all of those values.

This is a problem for me because I can tell that this is a critical concept.

## Homework Equations

My book gives me these equations for radians: x=30+360n or x=150+360n

For radians: pi/6+2piN or 5pi/6+2piN. The book goes into little detail as to how to work these equations, and I would very much appreciate it if someone could tell me how to work them.

## The Attempt at a Solution

One problem reads: List the solutions in degrees: cos^-1(1/2)= 60 (degrees), 300, 420, 660, 780, 1020, and I have absolutely no idea how they came up with that answer. Like I said before, I would really appreciate it if someone could help me with this, and please tell me if I should clarify any part of what I'm asking.