Applied Sciences, cilt.8, sa.1, ss.101-111, 2006 (Scopus)
The Iso-Taxicab Geometry is defined in 1989. The Iso-Taxicab trigonometric functions cosI(θ), sinI(θ), tan I(θ), and cotI(θ) 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". © Balkan Society of Geometers, Geometry Balkan Press 2006.