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

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$I\;=\;\int_a^b \,cotan^2(x) \,dx$ , $x$ unit: rad
$I\;=\;\int_a^b \,\frac{dx}{tan^2(x)}$ , $x$ unit: rad

You have three possibilities to introduce radians: 1) As simple reals eg 2.34 or 300 or 3,443 2) As multiples of $\pi$; eg: - If you want to enter $\frac{3\cdot\pi} {4}$, just type 3/4 - If you want to enter $\frac{\pi}{2}$, just type 1/2 - If you want to enter $\pi$, you simply type 1/1 2) As fractions of a root $\pi$; eg: - If you want to introduce $\frac{\sqrt{3}}{4}$, you just type 3:4 - If you want to introduce $\sqrt{3}$, you just type 3:1