4.7 & 4.8 - Inverse Trigonometric Functions and Applications & Models
Bearing Angle
In navigation bearing may refer, depending on the context, to any of: (A) the direction or course of motion itself; (B) the direction of a distant object relative to the current course (or the "change" in course that would be needed to get to that distant object); or (C), the angle away from North of a distant point as observed at the current point.
Inverse Properties of Trig Functions
sin(arcsin x) = x arcsin(sin y) = y cos(arccos x) = x arccos(cos y) = y tan(arctan x) = x arctan(tan y) = y
Definition of the Inverse Functions
y = arcsin x y = arccos x y = arctan x or y = sin-1 x y = cos-1 x y = tan-1 x