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Geometry 11 Online
OpenStudy (anonymous):

Suppose that A, B, C are three points, equidistant from O and that the segments BC, CA, AB subtend angles alpha , beta , gamma respectively at O. Let  theta be the angle between the planes AOB and AOC. Show that cos(alpha) = cos(beta)cos(gamma) + sin(beta)sin(gamma) cos(theta)

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