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.