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If f(x)=cos([pi^2|x)+cos([-pi^2|x), wher...

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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The correct Answer is:
A, C
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