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#maths

21 posts16 participants1 post today

A neat little trig relationship arose in class today.

In answering a question some students "panicked" and chucked it into "solve" in their TI Nspire graphics calculator (let's not get distracted by my hatred of such tech) and as part of the solution got:

π/2 - arctan(1/10)

Whereas if one did it (very simply) by hand, this term was:

arctan(10)

One hopes anyone marking this would understand they're the same, but it baffled the students... queue learning moment. 1/n

📖 🇺🇸 **After Failing Math Twice, a Young Benjamin Franklin Turned to This Popular 17th-Century Textbook**

_By age 16, “being on some occasion made ashamed of my ignorance in figures, which I had twice failed in learning when at school,” Franklin continued, “I took Cocker’s book of arithmetic and went through the whole by myself with great ease.”_

🔗 smithsonianmag.com/history/aft.

#History #Histodons #BenFranklin #Books #Bookstodon #Maths #Mathematics @histodons @bookstodon

Smithsonian MagazineAfter Failing Math Twice, a Young Benjamin Franklin Turned to This Popular 17th-Century TextbookA 19th-century scholar claimed that "Cocker's Arithmetick" had "probably made as much stir and noise in the English world as any [book]—next to the Bible"