Command: sin
  
Syntax: 
  x2 = sin(x1)
  
Description: 
  Return the sine of x1, where x1 is in radians.
  
Comments: 
  This function may be applied to an atom or to all elements
  of a sequence.
  
Example: 
     sin_x = sin({.5, .9, .11})
       -- sin_x is {.479, .783, .110} 

See Also: 
  cos, tan
  
