News for hackers. Stuff that matters.

A comment on Simple Proof of Fermats Last Theorem: Is There Any Mistake Here?.

Re:Simple Proof of Fermats Last Theorem: Is There Any Mistak... by codemaniac on Monday November 14, 2016 @05:20AM (#12948752)
How does cos(theta) produce irrational values for 60 deg <= theta <= 90 deg?
[ Parent | on HN ]
Re:Simple Proof of Fermats Last Theorem: Is There Any Mistak... by Mi_Ka_ on Monday November 14, 2016 @05:43AM (#12948856)
That is what I knew. For example- cos 75 = (√2(√3 – 1))/4

For testing you can visit here- http://www.webconversiononline.com/trigonometry-calculator.a...

[ Parent | on HN ]
Re:Simple Proof of Fermats Last Theorem: Is There Any Mistak... by nanis on Monday November 14, 2016 @05:47AM (#12948877)
cosine is a continuous function. Rationals are dense in reals etc. eg, arccos(1/3)
[ Parent | on HN ]
Re:Simple Proof of Fermats Last Theorem: Is There Any Mistak... by Mi_Ka_ on Monday November 14, 2016 @06:04AM (#12948966)
Yes, arccos(1/3) = 70.5287794 degrees
[ Parent | on HN ]
Re:Simple Proof of Fermats Last Theorem: Is There Any Mistak... by gus_massa on Monday November 14, 2016 @07:40AM (#12949407)
The important point is that

cos(arcos(1/3)) = cos(70.5287794... degrees) = 1/3

that is a rational value.

[ Parent | on HN ]