Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$\displaystyle\int{ \frac{ { \sec }^{ 2 } { \cot }^{ -1 } x }{ 1+ { x }^{ 2 } } }d x$$

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