$\definecolor{red}{RGB}{255,0,0}$$\definecolor{black}{RGB}{0,0,0}$
  1. I
  2. I
  4. I
    • $$\color{blue}{\rightarrow}\color{black}\;I \;= \;\frac{1}{c}\cdot arctan(\frac{b}{c})-\frac{1}{c}\cdot arctan(\frac{a}{c}) $$
  1. a
  2. a
  4. a
  1. b
  2. b
  4. b
  1. c
  2. c
  4. c

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$I\;=\;\int_a^b \,arctan\,x\,dx$, calculated with $rad$