anonymous
  • anonymous
I REAAAAAALLLLLLY NEED HELP! :'( express cos80ºcos70º+sin80ºsin70º as a single trigonometric function of a positive acute angle.
Mathematics
katieb
  • katieb
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anonymous
  • anonymous
well the answer is;0.86255518
anonymous
  • anonymous
how did you get that?
anonymous
  • anonymous
you need to use the double angle formula for cosine: \[\cos(\theta-\phi)=\cos(\theta)\cos(\phi)-\sin(\theta)\sin(\phi)\]

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anonymous
  • anonymous
You have \[\theta = 80, \phi = 70\]
anonymous
  • anonymous
Correction - the sign on the right-hand side should be +, not -.
anonymous
  • anonymous
your late dude
anonymous
  • anonymous
Not really - he asked for an explanation.
anonymous
  • anonymous
but cool cause my friend needed the formula thanks
anonymous
  • anonymous
or she...

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