& cos()
 
  Syntax: cos(<number>)
 
  Returns the cosine of <number>, expressed in radians.
 
  Examples:
 
  > say cos(0)
  You say "1"
  > say cos(fdiv(pi(),2))
  You say "0"
  > say cos(fdiv(pi(),4))
  You say "0.707107"
  > say cos(fdiv(pi(),6))
  You say "0.866025"
 	
  See Also: acos(), asin(), atan(), pi(), sin(), tan().
  