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Write a value of int((tan^(-1)x)^3)/(1+x...

Write a value of `int((tan^(-1)x)^3)/(1+x^2)\ dx`

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Solution:
Let `t=\tan ^-1 \x \Rightarrow \dt=\frac{1}{1+\x^{2}} \dx`
I=`\int \frac{(\tan ^-1 x)^3}{1+x^2} d x`
=`\int \t^3 \dt`
...
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