Cut-the-Knot-Action 13!

Autor:Tim Brzezinski

Creation of this applet was inspired by a tweet from Alexander Bogomolny. LARGE points are moveable at any time. How can you formally prove what this applet informally illustrates?

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solution to Giovanni Resta's 2016 puzzle
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Derivace
Tangens
Pravděpodobnost
Sinus
Úsečka