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  1. * coef                                                internal + external
  2. coef(y,form) gives the coefficient of form in the polynomial y. 
  3. It picks only terms that contain the particular form specified. x is
  4. not considered part of x^6.
  5. See also: coefall.
  6. e.g.
  7. IN:  coef(2*x^6+x+4, x^6), coef(2*x^6+x+4, x)
  8. OUT: 2, 1
  9.  
  10. coef(y, x, order) gives the coefficient of x with order in the polynomial
  11. y.  order < 5.
  12. e.g.
  13. IN:  coef(x^2+x+6, x, 0)
  14. OUT: 6
  15.