anonymous
  • anonymous
evaluate cos 220 cos40+sin220sin40
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
This question came up earlier, I think spanishkb31 is in your class...
anonymous
  • anonymous
okay, cos(-40) = cos(40) and cos(a+b) = cos(a)cos(b) - sin(a)sin(b)...
anonymous
  • anonymous
Nice memory :o

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anonymous
  • anonymous
so what is (a+b)?
anonymous
  • anonymous
you there?
anonymous
  • anonymous
yea
anonymous
  • anonymous
yea
anonymous
  • anonymous
you all set?
anonymous
  • anonymous
no lost
anonymous
  • anonymous
whats the step
anonymous
  • anonymous
well, if you replace cos(40) with cos(-40), you get: cos 220 cos(-40) - sin220sin(-40) which is the sum of angles formula for cosine cos(a+b) = cosa cosb - sina sinb so, what is (a+b) ?
anonymous
  • anonymous
im confused
anonymous
  • anonymous
whats the answer

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