lilsis76
  • lilsis76
express sin(17pi/12) in terms of rational numbers and radicals. how can i do this :/
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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lilsis76
  • lilsis76
@anikay think u can help me with this one?
anikay
  • anikay
remember what I said about pi/6?
lilsis76
  • lilsis76
er.....hold on, u said....pi//6 is 30 deg.

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lilsis76
  • lilsis76
@anikay
anikay
  • anikay
ok, so, what would 12 be? then?
lilsis76
  • lilsis76
let me draw it reallyfast
anikay
  • anikay
you're going to need to know your half angle formulas for this
lilsis76
  • lilsis76
ugh. i forgot it :/
anikay
  • anikay
well, sucks, because it's gonna be a 75 degree reference angle :P
lilsis76
  • lilsis76
hold on im looking up the formula
lilsis76
  • lilsis76
cos(2a)=cos^2 - sine^2 = 2cos^2 - 1 = 1 -2 sin^2
lilsis76
  • lilsis76
right? @anikay
anikay
  • anikay
awww D: no that's double angle
lilsis76
  • lilsis76
okay hold on let me check again
anikay
  • anikay
at least, the cos(2a) is
lilsis76
  • lilsis76
okay i got it, sin Q = 2 sin Q/2 cos Q/2, right?
anikay
  • anikay
uh, here
lilsis76
  • lilsis76
haha im not good at math seriously ugh, this is horrible. im sorry if im wasting your time
anikay
  • anikay
meh tryin to hit multiple problems
lilsis76
  • lilsis76
haha thank you
anikay
  • anikay
ok so its
anikay
  • anikay
\[\cos ^2 \frac{ \theta }{ 2 } = \frac{ 1+\cos(\theta) }{ 2 }\]
lilsis76
  • lilsis76
hm...okay, do i ....just plug in the 17pi/12?
anikay
  • anikay
uh....im tired xD
anikay
  • anikay
imma go with no
anikay
  • anikay
imma say plug in 150
lilsis76
  • lilsis76
okay :/ then ill skip it
lilsis76
  • lilsis76
why 150?
anikay
  • anikay
cuz 150/2 = 75 xD or you could try 17pi/6
lilsis76
  • lilsis76
haha where is the 17 pi coming froM?!
anikay
  • anikay
isn't that your original problem?
anikay
  • anikay
but multiplied by 2?
lilsis76
  • lilsis76
IT IS!!! haha i finally saw it haha
lilsis76
  • lilsis76
okay i have one more problem and its my last.
anikay
  • anikay
yesh?
anikay
  • anikay
I should sleep soon.... is this a better pastime than League of Legends? xD

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