The DiffTutor(f) command launches a tutor interface that solves the differentiation of f with respect to var, step-by-step.  If f is either an expression of the form Diff(g, ...) or a call diff(g, ...) that Maple returns unevaluated, the tutor solves the differentiation of g.

If f is not specified, DiffTutor uses a default function.

If var is not specified, the differentiation is performed with respect to one of the variables used in f.

When the tutor is closed, the solution steps displayed in the tutor are re-displayed in the worksheet, with annotations showing the rules applied.  Note that this a display only and is not a value which can be further manipulated from within the worksheet.  The value returned from the tutor, which can be used (for example, by referencing its equation label), is the state of the problem at the time the tutor was closed.

$\mathrm{with}\left(\mathrm{Student}\left[\mathrm{Calculus1}\right]\right)\:$

$\mathrm{DiffTutor}\left(\right)$

$\mathrm{DiffTutor}\left(x\cos \left(x\right)\right)$

$\mathrm{DiffTutor}\left(x\cos \left(x\right)\,x\right)$