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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 find `f(pi/2),f(pi/4)`.

A

`f(pi/2)=-1`

B

`f(pi)=1`

C

`f(-pi)=0`

D

`f(pi/4)=sqrt2`

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A
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