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and never touch a sphere tangentially

Posted by trfhjkl456789 at 2011-06-18 16:46:28 on Problem 1263 and last updated at 2011-06-18 16:47:13
In Reply To:If the ray goes along the targent of one sphere,does it mean "It hits the sphere"? Posted by:__XiO at 2010-01-27 16:16:56


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