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It is explained quite well in this video: http://www.youtube.com/watch?v=FpjWXKbCC3w

I hope that makes sense?

it made sense until you brought n into this... what is n exactly?

that should say "add (or subtract) multiples of \(2\pi\)..."

Hang on - you are supposed to find solutions between -360 and +360, correct?

yes -360 to 360
sorry helping others too

i know how to convert to radians

So first draw these two solutions we found as follows:
|dw:1349974770993:dw|

So then the negative angles that also satisfy the first equation will be:
|dw:1349974926971:dw|

Does that make sense?

the -210 makes sense, the -330 does not

-360 + 150 = -210
-360 + 30 = -330

|dw:1349975262412:dw|

|dw:1349975300819:dw|

Does that help?

okay so sin is fine
cosine?

Exactly the same principles

|dw:1349975392520:dw|

you are more than welcome my friend! I'm glad I was able to explain it to you. :)