SOLUTION: Solve for theta: cos(2theta+pi) = +/- (sqrt(2)/2) [There are no restrictions, so answer should have an infinite number of solutions.] A little bit of background... I realize

Question 977063: Solve for theta: cos(2theta+pi) = +/- (sqrt(2)/2) [There are no restrictions, so answer should have an infinite number of solutions.]
A little bit of background... I realize this may be a cut-above regular algebra and as such I'm sorry for posting it on here. The thing is, it's actually really easy stuff and I already know how to solve these. What's confusing me right now is how to write the answer(s) in a way that shows there are an infinite number of solutions. Most teachers restrict the domain. Not mine! Thank you guys again, very much!
Answer by Fombitz(32388) (Show Source): You can put this solution on YOUR website!

The solutions are,

So then,

And,

Simplifying,

where k is any integer.

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