(4 x +4x×π
please answer fast
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Answer:
Substitute x=
4
π
+t
lim
t→o
4t
1−tan(
4
π
+t)
=lim
t→0
4t
1−
1−tan t
(1+tan t)
=lim
t→0
(1−tan t)4t
−2tan t
=
2
−1
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