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Copy of Spherical Triangle: Napier's Rules

Author:Richard Tipton, Steve Phelps
Spherical right triangles and Napier's Rules http://upload.wikimedia.org/wikipedia/commons/thumb/0/07/Spherical_trigonometry_Napier_right-angled.svg/443px-Spherical_trigonometry_Napier_right-angled.svg.png

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