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If f:Rto[-1,1] where f(x)=sin((pi)/2[x])...

If `f:Rto[-1,1]` where `f(x)=sin((pi)/2[x]),` (where [.] denotes the greatest integer fucntion), then

A

`f(x)` is onto

B

`f(x)` is into

C

`f(x)` is periodic

D

`f(x)` is many one

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The correct Answer is:
B, C, D
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