seltanjo lujvo

t2 is the angle/arctangent of tangent t1.

Cf. sinso, tanjo, selsinso, seldutsinso.


In notes:

dutsinso
x1 is the trigonometric cosine of angle/arccosine x2.
seldutsinso
s2 is the angle/arccosine of cosine s1.
selsinso
s2 is the angle/arcsine of sine s1.