fun-lim

Question: The range of $f(x)=\cos x-\sin x$ is



1) $(-1,\ 1)$
2) $[-1,\,\ 1)$
3) $\left[ -\frac{\pi }{2},\ \frac{\pi }{2} \right]$
4) $[-\sqrt{2},\ \sqrt{2}]$
Solution: Explanation: No Explanation
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