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Mathematics
Mathematics
Problem
Calculate
f
′
(
π
4
)
f'\!\left(\frac{\pi}{4}\right)
f
′
(
4
π
)
for
f
(
x
)
=
tan
(
3
x
)
−
cot
x
f(x)=\tan(3x)-\cot x
f
(
x
)
=
tan
(
3
x
)
−
cot
x
.
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