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Mathematics
Problem
Evaluate:
∫
e
tan
−
1
x
(
1
+
x
+
x
2
1
+
x
2
)
d
x
\int e^{\tan^{-1} x} \left( \frac{1+x+x^2}{1+x^2} \right) dx
∫
e
t
a
n
−
1
x
(
1
+
x
2
1
+
x
+
x
2
)
d
x
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