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"I am thinking therefore I exist." (Latin:Cogito ergo sum) from the Discourse on Method Coordinate System: (坐标系) Cartesian coordinate system(直角坐标系) polar system(极坐标系) Coordinate System:(坐标系) Cartesian coordinate system(直角坐标系) polar system(极坐标系) "I am thinking therefore I exist." (Latin: Cogito ergo sum) from the Discourse on Method
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