Ge̍k-saⁿ-kak hâm-sò͘

Tī sò͘-ha̍k tiong, ge̍k-saⁿ-kak hâm-sò͘ (逆三角函數; inverse trigonometric functions), ia̍h-sī hoán-saⁿ-kak hâm-sò͘ (反三角函數), sī saⁿ-kak hâm-sò͘ ê ge̍k-hâm-sò͘.

Miâ	Hû-hō	Tēng-gī	Tēng-gī-e̍k	Ti̍t-e̍k
Ge̍k-chèng-hiân	$y=\arcsin x$	$x=\sin y$	$[-1,1]$	$[-{\frac {\pi }{2}},{\frac {\pi }{2}}]$
Ge̍k-û-hiân	$y=\arccos x$	$x=\cos y$	$[-1,1]$	$[0,\pi ]$
Ge̍k-chèng-chhiat	$y=\arctan x$	$x=\tan y$	$\mathbb {R}$	$(-{\frac {\pi }{2}},{\frac {\pi }{2}})$
Ge̍k-û-chhiat	$y=\operatorname {arccot} x$	$x=\cot y$	$\mathbb {R}$	$(0,\pi )$
Ge̍k-chèng-kat	$y=\operatorname {arcsec} x$	$x=\sec y$	$(-\infty ,-1]\cup [1,+\infty )$	$[0,{\frac {\pi }{2}})\cup ({\frac {\pi }{2}},\pi ]$
Ge̍k-û-kat	$y=\operatorname {arccsc} x$	$x=\csc y$	$(-\infty ,-1]\cup [1,+\infty )$	$[-{\frac {\pi }{2}},0)\cup (0,{\frac {\pi }{2}}]$