Example

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

Question

$$\displaystyle\int{ ( { x }^{ 2 } +1)/( { x }^{ 2 } -1) }d x =0$$

Evaluate

$\ln(|x-1|)-\ln(|x+1|)+x+С=0$

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