octave.exe:4> asin(1/2) ans = 0.52360
is it possible to get the result in form of:
ans = pi/6
It seems not possible with format function, but may be there are any tricks.
I assume it's the same as with Matlab, where you would do sym(asin(1/2)).
An alternative might be to convert into units of $\pi$ explicitly, and then seek a rational approximation: