In the Simple Units environment, any verifications of valid dimensions ignore so-called Unit annotations.

In the Simple Units environment, the arguments for the trigonometric or hyperbolic functions is unit-free. With the approach used in this environment, this includes plane angles. An error is returned if the dimension of the argument is not unit-free.

Every command in the Simple Units environment that needs to determine whether an expression is valid or not, does so using the Units:-TestDimensions command.

If the argument has a unit of angle, it is converted to a free expression in the call to the corresponding global function.  Therefore, a call to sin(7*deg) returns as sin(7/180*Pi), because $1$ degree equals $\frac{\mathrm{\pi }}{180}$ radians.

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

To enter a unit in 2-D Math input, select the unit from the appropriate Units palette. If the unit you want is not there, select $\mathrm{unit}$ and then enter the unit.

When you edit a unit, double brackets appear around it.

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

$\sin \left(3\mathrm{Unit}\left('\mathrm{deg}'\right)\right)$

$\sin \left(\frac{\mathrm{\pi }}{60}\right)$

$\sin \left(180\mathrm{Unit}\left('\mathrm{deg}'\right)\right)$

$0$

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

$\mathrm{-0.9918267366}$