Class 11MathematicsTrigonometrical Ratios, Functions and IdentitiesMaximum and minimum values of trigonometrical functions, Conditional trigonometrical identities
EasyThe range of $f(x) = \cos x - \sin x$ is
- A$(-1, 1)$
- B$[-1, 1)$
- C$[-\frac{\pi}{2}, \frac{\pi}{2}]$
- D$[-\sqrt{2}, \sqrt{2}]$
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