Discussion @ 1075. Thread in a Space @ Timus Online Judge

Online Judge	Problems	Authors	Online contests
About Online Judge Frequently asked questions Site news Webboard Links	Problem set Submit solution Judge status Guide	Register Update your info Authors ranklist	Current contest Scheduled contests Past contests Rules

back to board

Discussion of Problem 1075. Thread in a Space

Help me with trigonometry.

Posted by Yegor Suvorov 26 May 2007 16:53

I know cos(a) (Ac) and cos(b) (Bc). I need to get cos(b - a). How can I do it? I do it like this: cos(arccos(Bc) - arccos(Ac)). Maybe I can do it easier?

cos(a-b)= cos(a)cos(b)+sin(a)sin(b) (-)

Posted by diver_ru 26 May 2007 23:47