Question

express sin(17pi/12) in terms of rational numbers and radicals.

how can i do this :/

Answer 1

@anikay think u can help me with this one?

Answer 2

remember what I said about pi/6?

Answer 3

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

Answer 4

@anikay

Answer 5

ok, so, what would 12 be? then?

Answer 6

let me draw it reallyfast

Answer 7

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

Answer 8

ugh. i forgot it :/

Answer 9

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

Answer 10

hold on im looking up the formula

Answer 11

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

Answer 12

right? @anikay

Answer 13

awww D: no that's double angle

Answer 14

okay hold on let me check again

Answer 15

at least, the cos(2a) is

Answer 16

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

Answer 17

uh, here

Answer 18

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

Answer 19

meh tryin to hit multiple problems

Answer 20

haha thank you

Answer 21

ok so its

Answer 22

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

Answer 23

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

Answer 24

uh....im tired xD

Answer 25

imma go with no

Answer 26

imma say plug in 150

Answer 27

okay :/ then ill skip it

Answer 28

why 150?

Answer 29

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

Answer 30

haha where is the 17 pi coming froM?!

Answer 31

isn't that your original problem?

Answer 32

but multiplied by 2?

Answer 33

IT IS!!! haha i finally saw it haha

Answer 34

okay i have one more problem and its my last.

Answer 35

yesh?

Answer 36

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