Template:DomainsImagesAndPrototypesOfTrigAndInverseTrigFunctions

The table below displays names and domains of the inverse trigonometric functions along with the range of their usual principal values in radians.

Original function		Domain		Image/range	Inverse function		Domain of inverse		Range of usual principal values of inverse
$\sin$	$:$	$\mathbb {R}$	$\to$	$[-1,1]$	$\arcsin$	$:$	$[-1,1]$	$\to$	$\left[-{\frac {\pi }{2}},{\frac {\pi }{2}}\right]$
$\cos$	$:$	$\mathbb {R}$	$\to$	$[-1,1]$	$\arccos$	$:$	$[-1,1]$	$\to$	$[0,\pi ]$
$\tan$	$:$	$\pi \mathbb {Z} +\left(-{\frac {\pi }{2}},{\frac {\pi }{2}}\right)$	$\to$	$\mathbb {R}$	$\arctan$	$:$	$\mathbb {R}$	$\to$	$\left(-{\frac {\pi }{2}},{\frac {\pi }{2}}\right)$
$\cot$	$:$	$\pi \mathbb {Z} +(0,\pi )$	$\to$	$\mathbb {R}$	$\operatorname {arccot}$	$:$	$\mathbb {R}$	$\to$	$(0,\pi )$
$\sec$	$:$	$\pi \mathbb {Z} +\left(-{\frac {\pi }{2}},{\frac {\pi }{2}}\right)$	$\to$	$(-\infty ,-1]\cup [1,\infty )$	$\operatorname {arcsec}$	$:$	$(-\infty ,-1]\cup [1,\infty )$	$\to$	$\left[0,{\frac {\pi }{2}}\right)\cup \left({\frac {\pi }{2}},\pi \right]$
$\csc$	$:$	$\pi \mathbb {Z} +(0,\pi )$	$\to$	$(-\infty ,-1]\cup [1,\infty )$	$\operatorname {arccsc}$	$:$	$(-\infty ,-1]\cup [1,\infty )$	$\to$	$\left[-{\frac {\pi }{2}},0\right)\cup \left(0,{\frac {\pi }{2}}\right]$

The symbol $\mathbb {R} =(-\infty ,\infty )$ denotes the set of all real numbers. The set of all integer multiples of $\pi$ is denoted by $$\pi \mathbb {Z} ~:=~\{\pi n:n\in \mathbb {Z} \}~=~\{\ldots ,-2\pi ,-\pi ,0,\pi ,2\pi ,3\pi ,4\pi ,\ldots \}$$ and the notation $\pi \mathbb {Z} +(a,b)$ denotes the Minkowski sum of $\pi \mathbb {Z}$ and the interval $(a,b).$ Explicitly, $${\begin{alignedat}{4}\pi \mathbb {Z} +(0,\pi )&~=~\cdots \cup (-2\pi ,-\pi )\cup (-\pi ,0)\cup (0,\pi )\cup (\pi ,2\pi )\cup (2\pi ,3\pi )\cup (3\pi ,4\pi )\cup \cdots \\&~=~\mathbb {R} \setminus \pi \mathbb {Z} \\\end{alignedat}}$$ and $${\begin{alignedat}{4}\pi \mathbb {Z} +\left(-{\frac {\pi }{2}},{\frac {\pi }{2}}\right)&~=~\cdots \cup \left(-{\frac {3\pi }{2}},-{\frac {\pi }{2}}\right)\cup \left(-{\frac {\pi }{2}},{\frac {\pi }{2}}\right)\cup \left({\frac {\pi }{2}},{\frac {3\pi }{2}}\right)\cup \left({\frac {3\pi }{2}},{\frac {5\pi }{2}}\right)\cup \left({\frac {5\pi }{2}},{\frac {7\pi }{2}}\right)\cup \cdots \\&~=~\mathbb {R} \setminus \left({\frac {\pi }{2}}+\pi \mathbb {Z} \right)\\\end{alignedat}}$$ where $\,\setminus \,$ denotes set subtraction. In other words, the domain of $\,\cot \,$ and $\,\csc \,$ is the set $\mathbb {R} \setminus \pi \mathbb {Z}$ of all real numbers that are not of the form $\pi n$ for some integer $n.$ Similarly, the domain of $\,\tan \,$ and $\,\sec \,$ is the set $\mathbb {R} \setminus \left({\frac {\pi }{2}}+\pi \mathbb {Z} \right)$ of all real numbers that do not belong to the set $${\frac {\pi }{2}}+\pi \mathbb {Z} ~:=~\left\{{\frac {\pi }{2}}+\pi n:n\in \mathbb {Z} \right\}=\left\{\ldots ,-{\frac {3\pi }{2}},-{\frac {\pi }{2}},{\frac {\pi }{2}},{\frac {3\pi }{2}},{\frac {5\pi }{2}},{\frac {7\pi }{2}}\ldots \right\};$$ said differently, it is the set of all real numbers that are not of the form ${\frac {\pi }{2}}+\pi n$ for some integer $n.$