Implicit differentiation on HP Prime.

[Han]

When I do:

diff(3*7^x-x*g(x^2),x)

I get:

-x*diff(g(x^2),x)+3*7^x*LN(7)-g(x^2)

which is pretty much correct except it did not simplify diff(g(x^2),x) since it has no idea what g(x) is -- I intentionally left g(x) undefined for this example.