几何函数表示余切函数

后面常加角度，如:ctg60

概念:表示直角三角形中,邻边比对边


作为缩写ctg有以下缩写
ctgcartridge
ctgcradle-to-grave
ctgcardiotocograph
ctgcenterfortechnologyingovernment(suny,albany,newyork)
ctgcomputertaskgroup(itconsultingcompany;buffalo,ny,usa)
ctgcentroturisticogiovanile(italian:turisticcenterforyoungpeople)
ctgcentrodetradiçõesgaúchas(gauchoculturalassociations)
ctgcouncilfortradeingoods
ctgcentertheatregroup(losangeles,ca,usa)
ctgcentrefortechnicalgeoscience(netherlands)
ctgcicstransactiongateway(ibm)
ctgcommander,taskgroup
ctgcadettraininggroup
ctgcomprehensivetechnicalgroup
ctgcontroltechniquesguidelines
ctgcartagena,colombia-rafaelnunez(airportcode)
ctgcombustionturbinegenerator
ctgcontroltechnologyguidelines
ctgcoretechnicalgroup
ctgcommander'strainingguidance
ctgcareertrainingguide
ctgcorporationtestgroup
ctgcasinotablegame
ctgconstrainedtaskflowgraph
ctgcomputingandtechnologygroup
ctgcoolantturbinegenerator