anonymous
  • anonymous
Evaluate cos220cos40 + sin220sin40
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
are you looking for the answer in terms of radians, degrees, or just reagular numbers?
anonymous
  • anonymous
I honestly don't know. It doesn't say. Probably either degrees or regular numbers.
anonymous
  • anonymous
220 - 40 = 180, that's gotta be a part of it, doncha think?

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anonymous
  • anonymous
thats probable
anonymous
  • anonymous
ok man look in the back of ur book for questions next to this
anonymous
  • anonymous
see what its asking for
anonymous
  • anonymous
okay, cos(-40) = cos(40) and cos(a+b) = cos(a)cos(b) - sin(a)sin(b)...
anonymous
  • anonymous
... so (a+b) = 220 + -40
anonymous
  • anonymous
ohhh. thank you so much! I missed class today and my teacher just gave me the notes so I was a little confused! Thank you!
anonymous
  • anonymous
not to be petty, but my friend and I are competing for medals...

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