Which of the following functions from A ...

Which of the following functions from `A = {x : − 1 le x le 1}` to itself are bijections?

A

`f(x}=|x|`

B

`f(x)=sin(pix/2)`

C

`f(x)=sin(-pix/2)`

D

`f(x)=tan(pix/4)`

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