lilsis76
express sin(17pi/12) in terms of rational numbers and radicals.
how can i do this :/



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lilsis76
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@anikay think u can help me with this one?

anikay
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remember what I said about pi/6?

lilsis76
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er.....hold on, u said....pi//6 is 30 deg.

lilsis76
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@anikay

anikay
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ok, so, what would 12 be? then?

lilsis76
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let me draw it reallyfast

anikay
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you're going to need to know your half angle formulas for this

lilsis76
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ugh. i forgot it :/

anikay
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well, sucks, because it's gonna be a 75 degree reference angle :P

lilsis76
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hold on im looking up the formula

lilsis76
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cos(2a)=cos^2  sine^2 = 2cos^2  1 = 1 2 sin^2

lilsis76
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right? @anikay

anikay
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awww D: no that's double angle

lilsis76
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okay hold on let me check again

anikay
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at least, the cos(2a) is

lilsis76
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okay i got it,
sin Q = 2 sin Q/2 cos Q/2, right?

anikay
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uh, here

lilsis76
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haha im not good at math seriously ugh, this is horrible. im sorry if im wasting your time

anikay
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meh tryin to hit multiple problems

lilsis76
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haha thank you

anikay
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ok so its

anikay
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\[\cos ^2 \frac{ \theta }{ 2 } = \frac{ 1+\cos(\theta) }{ 2 }\]

lilsis76
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hm...okay, do i ....just plug in the 17pi/12?

anikay
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uh....im tired xD

anikay
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imma go with no

anikay
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imma say plug in 150

lilsis76
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okay :/ then ill skip it

lilsis76
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why 150?

anikay
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cuz 150/2 = 75 xD or you could try 17pi/6

lilsis76
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haha where is the 17 pi coming froM?!

anikay
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isn't that your original problem?

anikay
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but multiplied by 2?

lilsis76
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IT IS!!! haha i finally saw it haha

lilsis76
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okay i have one more problem and its my last.

anikay
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yesh?

anikay
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I should sleep soon.... is this a better pastime than League of Legends? xD