|   | 1 |  initial version  | 
As a workaround, in the Jupyter notebook, use latex instead of show:
%display latex
x, y = var('x y')
f = x^2 + y^2
latex("f_x = " + latex(diff(f, x)))
$f_x = 2 x$
 Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.
 
                
                Copyright Sage, 2010. Some rights reserved under creative commons license. Content on this site is licensed under a Creative Commons Attribution Share Alike 3.0 license.