Khác biệt giữa các bản “Hệ tọa độ cầu”

Rescuing 1 sources and tagging 0 as dead.) #IABot (v2.0.7
(Rescuing 1 sources and tagging 0 as dead.) #IABot (v2.0.7)
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== Liên kết ngoài ==
* [http://www.math.montana.edu/frankw/ccp/multiworld/multipleIVP/spherical/learn.htm Spherical Coordinates] {{Webarchive|url=https://web.archive.org/web/20090213203445/http://www.math.montana.edu/frankw/ccp/multiworld/multipleIVP/spherical/learn.htm |date=2009-02-13 }}
* [http://www.random-science-tools.com/maths/coordinate-converter.htm Coordinate Converter - converts between polar, Cartisian and spherical coordinates]
 
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