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Problem
Problem
Let
ϕ
(
x
)
=
sin
(
cos
x
)
\phi(x) = \sin(\cos x)
ϕ
(
x
)
=
sin
(
cos
x
)
, then check whether it is increasing or decreasing in
[
0
,
π
/
2
]
[0, \pi/2]
[
0
,
π
/2
]
.
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