convert an expression of the form D(f)(x) to diff(f(x),x)
convert( expr, diff);
The command, convert(expr,diff) replaces, where possible, the use of the D operator by the use of the diff function in the expression expr.
g ≔ D2⁡y⁡x−a⁢D⁡z⁡x+D2⁡f⁡x,y:
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