Question

Which represents an even function?

y=cos(x)

Answer 1

The cosine is an even function which means that if (x,y) is on the graph of the function so too is the point (-x,y). Since y corresponds to cos(x) then this means that cos(-x) = cos(x).

Explanation:

Hope this helps

Answer 2

I think the one that represents a even function is cos(x)