Solve tan-1 14 + 2 tan-1 15 + tan-1 16 + tan-1 1x = π4

Solve $\tan^{- 1} \frac{1}{4} + 2 \tan^{- 1} \frac{1}{5} + \tan^{- 1} \frac{1}{6} + \tan^{- 1} \frac{1}{x} = \frac{π}{4}$

Matching exercise

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

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