pottersheep
  • pottersheep
Stuck on Trig identities! :( Help please~ How do I prove cos(x+y)cosy + sin(x+y)siny = cosx??
Mathematics
chestercat
  • chestercat
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anonymous
  • anonymous
just to understanding the formula : cosAcosB + sinAsinB = cos(A-B)
pottersheep
  • pottersheep
Yep I understand
pottersheep
  • pottersheep
I cant get the answer still though

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anonymous
  • anonymous
change A to (x+y) and B to y
pottersheep
  • pottersheep
I got it! Ha, it was easier than I thought :)
anonymous
  • anonymous
yep, very easy :)
pottersheep
  • pottersheep
You can have the medal :)
anonymous
  • anonymous
thanks, lol

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