Dumb piloting question

[Han]

(01-14-2017 07:33 PM)lrdheat Wrote:  How do I enter a d/dX function such as d(sin X)/dX into the graphing app to plot? I keep getting a plot where f(X)=0 for all X.

Type: F1:=diff(SIN(X),X); [ENTER] at the command line, then press the Plot button. I am not sure you can simply enter in diff(SIN(X),X) in the Symb view because it does not evaluate the definition, unlike the command line. In other words, typing F1:=diff(SIN(X),X) at the command line evaluates the right hand side and thus defines F1(X) as COS(X). Typing it in the Symb view creates F1(X) as diff(SIN(X),X) (since there is no evaluation) so that F1(1) is diff(SIN(1),1) and is therefore non-sensical.