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answered 2013-08-24 20:55:47 +0100
Try this:
sage: g=function('g',x) sage: var('y') sage: temp=diff(9*x^(1/2) - 2*g^(3/5) - g) sage: pretty=solve(temp,diff(g))[0].right().subs({g(x):y}) sage: show(pretty)