anonymous
  • anonymous
Find the exact value by using a half-angle identity. sine of seven pi divided by eight.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
\[\frac{7\pi}{8}\] is half of \[\frac{7\pi}{6}\]
anonymous
  • anonymous
thats it?
Miracrown
  • Miracrown
@satellite73 7π/8 is NOT half of 7π/6

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Miracrown
  • Miracrown
@jon321 do you know what the half of 7π/8 would be then?
anonymous
  • anonymous
1.37
anonymous
  • anonymous
lol so it isnt!
Miracrown
  • Miracrown
nope lol
anonymous
  • anonymous
multiply \(\frac{7\pi}{8}\) by \(2\)
anonymous
  • anonymous
and forget about decimals, you are supposed to use the "half angle" formula, like it says
anonymous
  • anonymous
.3827
anonymous
  • anonymous
7pie/4
anonymous
  • anonymous
yeah that one
anonymous
  • anonymous
thats the answer?
jim_thompson5910
  • jim_thompson5910
you'll need to know the value of cos(7pi/4) and you'll plug it into the half angle identity see this reference sheet http://tutorial.math.lamar.edu/pdf/Trig_Cheat_Sheet.pdf specifically, the "Half Angle Formulas" section at the top of page 2

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