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  1. * d                                                   internal + external
  2. d() gives the partial derivative.                     
  3.  
  4. d(y,x)                                                internal
  5. It differentiate y with respect to x.
  6. e.g. d(x^2,x) gives 2*x.
  7. d(f(x),x) is the same as f'(x) .
  8. e.g. d(sin(x),x) gives cos(x).
  9.  
  10. d(y, x, n)                                            external
  11. It gives the n-th order derivative of y with respect to an undefined
  12. variable x.
  13. e.g. d(sin(x),x,2) gives -sin(x).
  14.  
  15. See also: diff, f'(x), lim, inte, ninte.
  16.