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A dumb question, but I'll ask...how do I plot d/dx of a function in the function app.

Example...how do I properly enter d(sin(x)^4)/dx into the function app?

Try

curly d F1(X)/curly d X=X

if sin(X)^4 is in F1(X).

There was a thread about this a while back . . .

Thanks...the earlier thread that you suggested explained it well, and the need for x=x in the denominator as in dF(1)/dX=X was explained clearly (as opposed to the d/dx equaling X).