This image is a derivative work of the following images: File:Cartesian-coordinate-system.svg licensed with Cc-by-sa-3.0-migrated, GFDL, PD-user 2011-07-22T03:11:37Z
and hyperbolic trigonometric ratios corresponding to same angle in cartesianplane. author name string: Maschen Wikimedia username: Maschen URL: http://commons