Graphs of functions
Mmx]  
use "graphix"
Mmx]  
foo (x) == x * sin x;
Mmx]  
bar (x) == x * cos x;
Mmx]  
$width ("4ln", $graph (bar))

Mmx]  
$group ($color ("blue", $graph (foo)), $color ("red", $graph (bar)))

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