The best replacement for cos is qos.

The best alternatives to cos are rated as following:
★★★★★  qos
★★★★  sin
★★★★  dscp
★★  cosh
★★  tos
★★  cogs
★  sin graph
★  cause
★  acos
  arccos
  settlement house
  reedley
  romaine
  coz
  sec
  qos mpls
  cuz
  consular processing
  cos
  cos sin
  sg&a
  tan=cos\/sin
  ip precedence

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cos
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