cdb <colin <at> btech-online.co.uk> writes:
> Doing some sining and cosining  (hmm co-sinning interesting) and my 
> trusty ancient Casio fx-500f informs me that the sine of 90 deg is 
> 0.893996663, sin 45 is 0.850903524.

Not sure what you mean, low battery will always cause trouble excepting that
most better calculators DO have a low battery indicator. Anyway don't trust your
calculator too much even with a new battery. Calculators are really 'variable'
in transcendental operation results. I only trust them after checking with an
infinite precision calculator set to a significantly higher number of digits
than those displayed by the $9 'pocket math genius'. Read more about it here:

  http://www.rskey.org/~mwsebastian/miscprj/results.htm

Peter
 

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