<function name="atan" parent="math" type="libraryfunc"> <description>Returns the of the given number.</description> <description>Returns the [arctangent](https://en.wikipedia.org/wiki/Inverse_trigonometric_functions) of the given number.</description> <realm>Shared and Menu</realm> <args> <arg name="normal" type="number">Tangent value.</arg> </args> <rets> <ret name="" type="number">An angle in radians, in the range -pi/2 to pi/2, which has the given tangent.</ret> </rets> </function>