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Mathematics
Problem
In Exercises 5-22, prove the identity. 19.
tan
(
u
+
3
π
4
)
=
tan
u
−
1
1
+
tan
u
\tan \left(u+\frac{3 \pi}{4}\right)=\frac{\tan u-1}{1+\tan u}
tan
(
u
+
4
3
π
)
=
1
+
t
a
n
u
t
a
n
u
−
1
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