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If - pi/2 lt x lt pi/2, then the range o...

If `- pi/2 lt x lt pi/2`, then the range of the function `f(x)=cos [x] ` is

A

{1, cos1, cos 2}

B

{cos 1, -cos1, 1}

C

{-1,0,1}

D

{-1,1}

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A
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