Add new comment


I was enlightened by this article, especially after being scared off trig functions at school. I was even more enlightened when I punched in cos (1) into my calculator, a Casio fx-85GT PLUS which does have a cosine button, and got 0.9998... instead of 0.54... After an hour's bafflement I realised I needed to shift the set-up to radians, whereas I'd never got beyond degrees at school. Great, something more I've learnt. Purely as a matter of curiosity though, is it possible to come up with a power series that does as neatly converge on a value in degrees?

Chris G

Filtered HTML

  • Web page addresses and email addresses turn into links automatically.
  • Allowed HTML tags: <a href hreflang> <em> <strong> <cite> <code> <ul type> <ol start type> <li> <dl> <dt> <dd>
  • Lines and paragraphs break automatically.
  • Want facts and want them fast? Our Maths in a minute series explores key mathematical concepts in just a few words.