1. I
2. I
4. I

5. $$\color{blue}{\rightarrow}\color{black}\;I \;= \;\frac{1}{c}\cdot arctan(\frac{b}{c})-\frac{1}{c}\cdot arctan(\frac{a}{c}) $$

1. a
2. a
4. a

1. b
2. b
4. b

1. c
2. c
4. c

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$I\;=\;\int_a^b \,\frac{dx}{x^2-c^2}$ , $c^2>x^2$