I did not know this
http://www.homeschoolmath.net/teaching/sine_calculator.php (http://www.homeschoolmath.net/teaching/sine_calculator.php)
Very interesting, thanks for sharing :D
Yep, pretty interesting. Calcualtors usually use an approximation based on basic operations and it usually does the job up to the precision of the calculator and it shows up instantly, but I believe, correct me if I'm wrong, some used lookup tables.
I think I read that the definitions of these functions are implementation-specific, so could be