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Mathematics
Mathematics
Problem
Determine all
x
x
x
in
[
−
π
2
,
π
2
]
\left[-\frac{\pi}{2},\,\frac{\pi}{2}\right]
[
−
2
π
,
2
π
]
for which the function
f
(
x
)
=
tan
x
−
x
f(x)=\tan x - x
f
(
x
)
=
tan
x
−
x
is increasing.
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