If function $f : R \to S, f(x) = (\sin x -\sqrt 3 \cos x+1)$ is onto, then $S$ is equal to
If function $f : R \to S, f(x) = (\sin x -\sqrt 3 \cos x+1)$ is onto, then $S$ is equal to
- A
$[0,1]$
- B
$[-1,1]$
- C
$[0,3]$
- D
$[-1,3]$
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