A 300-Page Trigonometric Expression
A book-length trig identity that should simplify to sin(x), with an apology in case of errors.
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Free for classrooms, worksheets, slides and other non-commercial use under CC BY-NC 4.0, with credit to Ben Orlin.
Cartoon by Ben Orlin, Math with Bad Drawings. https://cartoons.mathwithbaddrawings.com/2016-01-27-a-300-page-trigonometric-expression/ (CC BY-NC 4.0)Transcript
[Book cover] "A 300-Page Trigonometric Expression that Eventually Simplifies to sin(x) (Unless We Made a Mistake Somewhere — in Which Case, Sorry About That)"