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> fcn := sin;
> diff(fcn(x),x); > Diff(fcn(x),x);
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> fcn := x -> x^2 * sin(x);
> diff(fcn(x),x); > Diff(fcn(x),x);
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> fcn := (x,y) -> sin(x)*cos(y);
> D[1](fcn); > D[2](fcn); > diff(fcn(x,y),x); > diff(fcn(x,y),y); > Diff(fcn(x,y),x);
> Diff(fcn(x,y),y);
> D[1,2](fcn); > diff(fcn(x,y),x,y); > diff(fcn(x,y),x$2); > Diff(fcn(x,y),x,y);
> Diff(fcn(x,y),x$2);
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