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Mathematics
Problem
Evaluate
∫
(
x
2
−
1
)
d
x
(
x
4
+
3
x
2
+
1
)
tan
−
1
(
x
+
1
x
)
\int \frac{(x^2 - 1) dx}{(x^4 + 3x^2 + 1) \tan^{-1} \left( x + \frac{1}{x} \right)}
∫
(
x
4
+
3
x
2
+
1
)
tan
−
1
(
x
+
x
1
)
(
x
2
−
1
)
d
x
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