Deriving Spherical Law of Cosines
This video tutorial explains how to derive the spherical law of cosines using a gnomonic projection and planar trigonometry. When a spherical triangle is projected onto a plane in this way, it becomes a planar triangle that we can use the original law of Cosines on. Webpage to help visualize secant (and other trig functions): https://visualize-it.github.io/trig_f...
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