Very nice!
One minor point, the "/" in the 2nd equation " ((4+c)*y)^(4+2) / 5-s^200" gets a bit confused with the tree structure as you also use "/" to print the tree:
-
__/ \__
/ ^
__/ \ / \
^ 5 s 2
^
^
^
Maybe you could use "'/'" (that's a bit hard to read, here it is again with 4 spaces added: " ' / ' ") or similar to make it stand out a bit more:
-
__/ \__
'/' ^
__/ \ / \
^ 5 s 2
^
^
^
?
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