4 ms·

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.aspx?angle

by Mi_Ka_ 10y ago

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.aspx?anglein=degree&type=cosine&of=85 http://www.webconversiononline.com/trigonometry-calculator.a...

nanis 10y ago
cosine is a continuous function. Rationals are dense in reals etc. eg, arccos(1/3)
- Mi_Ka_ 10y ago
  Yes, arccos(1/3) = 70.5287794 degrees
  - gus_massa 10y ago
    The important point is that cos(arcos(1/3)) = cos(70.5287794... degrees) = 1/3 that is a rational value.
deleted 10y ago
[deleted]