This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Overlaid pictures over one another and changed colors to distinguish. The original can be viewed here: Cotan proportional.svg: . Modifications made by Adrignola.

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This image is a derivative work of the following images:

• File:Tan_proportional.svg licensed with PD-self
  • 2007-12-10T18:09:27Z Olaf 658x620 (22504 Bytes) {{Information |Description=Plot of tan(x) with proportional scales and the gnuplot source |Source=self-made |Date= |Author= [[User:Olaf m|Olaf m]] |Permission= |other_versions= }} set terminal svg enhanced font "Arial,10" si
  • 2007-12-10T17:56:29Z Olaf 600x480 (22495 Bytes) {{Information |Description=Plot of tan(x) with proportional scales and the gnuplot source |Source=self-made |Date= |Author= [[User:Olaf m|Olaf m]] |Permission= |other_versions= }} set terminal svg enhanced font "Arial,10" si

• File:Cotan_proportional.svg licensed with PD-self
  • 2007-12-10T18:11:56Z Olaf 658x620 (22198 Bytes) {{Information |Description=Plot of cotan(x) with proportional scales and the gnuplot source |Source=self-made |Date= |Author= [[User:Olaf m|Olaf m]] |Permission= |other_versions= }} set terminal svg enhanced font "Arial,10"