The range of f(x) = cos x - sin x is...

The range of `f(x) = cos x - sin x` is

A

1) `(-1, 1)`

B

2) `[-1, 1)`

C

3) `[-(pi)/(2), (pi)/(2) ]`

D

4) `[- sqrt2, sqrt2]`

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The correct Answer is:

D

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