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**1. Homework Statement**

I solve the equation of one function, which comes out with two solutions:

1. cosx=-1, x=(2k+1)[itex]\pi[/itex] ; 2. cosx=1, x=2k[itex]\pi[/itex] (k [itex]\in \mathbb{Z})[/itex]

**2. Homework Equations**

**3. The Attempt at a Solution**

Now, we need to find union between the two of the solutions:

{[itex]\pi + 2k\pi[/itex]}[itex]\cup[/itex]{[itex]2k\pi [/itex]}= ??

What will be the solution of this one?

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