SOLUTION: the graph of the trigonometric function y=2cos(1/2x) is shown below. Sorry but it won't allow me to copy and paste the graph so I hope you guys know how this graph looks like from

Question 550102: the graph of the trigonometric function y=2cos(1/2x) is shown below. Sorry but it won't allow me to copy and paste the graph so I hope you guys know how this graph looks like from the function.
My act answer key has f, i just want to know how it got that bcuz i have no clue so showing work would be very much appreciated.
the function is what?
f.even (that is, f(x)=f(-x) for all x)
g.odd (that is, f(-x)=-f(x) for all x)
h.neither even nor odd.
j.the inverse of a cotangent function
k.undfined at x=pi(3.14)
Answer by mathstutor458(57) (Show Source): You can put this solution on YOUR website!
we know that cos(-x)=cosx
so,2cos(1/2x)=2cos(-1/2x) which is a even function
so , f is correct
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