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Mathematics
General Math
Differentiating the Dot Product's Evil Twin
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[QUOTE="Trying2Learn, post: 6333633, member: 654601"] [B]TL;DR Summary:[/B] Title says it all Hello, I found this link very useful: [URL]https://www.quora.com/Why-is-cosine-used-in-dot-products-and-sine-used-in-cross-products[/URL] I understand all of Anders Kaseorg's discussion except for ONE PONT. At the very end, he writes: "[the evil twin of the dot product] is not differentiable at parallel vectors." Could someone explain why? (I can see the issue with the evil twin of the cross, but not the dot) [/QUOTE]
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Mathematics
General Math
Differentiating the Dot Product's Evil Twin
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