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

If ` f(x)= cos [pi ^(2) ] x+ cos [-pi ^(2) ] x,` where [x] stands for the greatest integer functions , then

A

`f(pi/2)= -1`

B

`f(pi)=1`

C

`f(-pi)=1`

D

`f(pi/4)=1`

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The correct Answer is:

A, C

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