On the Iso-taxicab trigonometry

Abstract

The Iso-Taxicab Geometry is defined in 1989. The Iso-Taxicab trigonometric functions cosI(?), sinI(?), tan I(?), and cotI(?) are defined in [1]. The aim of this paper is to give the reduction, addition-substraction and half-angle formulas of Iso- taxicab trigonometry. Finally, we will give the "Table of Iso-Taxicab Trigonometry"