If f(x)=cos[pi^2]x +cos[-pi^2]x , where...

If `f(x)=cos[pi^2]x +cos[-pi^2]x ,` where `[x]` stands for the greatest integer function, then (a)`f(pi/2)=-1` (b) `f(pi)=1` (c)`f(-pi)=0` (d) `f(pi/4)=1`

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