Let u =5arctan(1/x), dv dx
Let u = 5 arctan(1/x), dv = dx
du
=
51
+
1 (1/x)2
?
-1 x2
dx
=
5
-dx x2 + 1
,
v
=
x.
Then
3 1
5
arctan
1 x
dx
=
x ? 5 arctan
1 x
3
+
1
3 5x dx 1 x2 + 1
5
= 5 36 - 5 ? 4 + 2
ln(x2 + 1)
3 1
5 3 5 5
=
6
-
4
+
(ln 2
4
-
ln
2)
5 3 5 5 4
= 6 - 4 + 2 ln 2
5 3 5 5
=
6
-
4
+ ln 2 2
................
................
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