Solve tan-1x-2x-1 + tan-1 x+2x+1 = π4

Solve $\tan^{- 1} (\frac{x - 2}{x - 1}) + \tan^{- 1} (\frac{x + 2}{x + 1}) = \frac{π}{4}$

Matching exercise

Match the items on the right to the items on the left.

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