[issue40113] Turtle demo

[Davide Golinelli]

Davide Golinelli <davi84 at gmail.com> added the comment:

I attacched a picture where you can see the cursor drawing backwars.

the program is supposed to draw a function like y=sin(x) but is drawing y=abs(sin(x)).

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Added file: https://bugs.python.org/file49012/backwards.png

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