Use an addition or subtraction formula to simplify the expression:
tan
(
π
2
−
u
)
=
cot
(
f
(
u
)
)
\displaystyle {\tan{{\left({\frac{{\pi}}{{{2}}}}-{u}\right)}}}={\cot{{\left({f{{\left({u}\right)}}}\right)}}}
tan
(
2
π
−
u
)
=
cot
(
f
(
u
)
)
.
f
(
u
)
=
\displaystyle {f{{\left({u}\right)}}}=
f
(
u
)
=
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