[Jprogramming] minor error in vocabulary

[Bo Jacoby]

Hi!
There seems to be a minor error in the description of D. Derivative

The line 

   (*/\ VD y);(sin x);(sin D x);(sin D D x)
should read
   (*/\ VD x);(sin x);(sin D x);(sin D D x)

That is, the y should be an x. 

Thanks! Bo.