In the Natural Units environment, the arguments for the inverse trigonometric or hyperbolic functions must have dimension 1. Otherwise, an error is returned.

For other properties, see the global functions in the arctrig help page.

$\mathrm{with}\left(\mathrm{Units}\left[\mathrm{Natural}\right]\right)\:$

$\arcsin \left(0.323\right)$

$0.3288976902$

$\arcsin \left(\frac{1.3m}{\mathrm{km}}\right)$

$0.001300000366$

$\arccos \left(\cos \left(172.\mathrm{deg}+40.\mathrm{arcmin}+10.32\mathrm{arcsec}\right)\right)$

$3.013651875$