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Problem
Problem
The range of
f
(
x
)
=
cos
x
−
sin
x
f(x)=\cos x-\sin x
f
(
x
)
=
cos
x
−
sin
x
is (a)
(
−
1
,
1
)
(-1,1)
(
−
1
,
1
)
(b)
[
−
1
,
1
)
[-1,1)
[
−
1
,
1
)
(c)
[
−
π
2
,
π
2
]
[-\frac{\pi}{2},\frac{\pi}{2}]
[
−
2
π
,
2
π
]
(d)
[
−
2
,
2
]
[-\sqrt{2},\sqrt{2}]
[
−
2
,
2
]
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