Question

Find an exact value of
\[\cos \frac{ \pi }{ 12 }\]

Answer 1

need hellp

Answer 2

https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB4QtwIwAA&url=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DoGgkltX_FoY&ei=o3c6VZW2DYm1ogSWjIGQAQ&usg=AFQjCNGRMobJDzOUYeGsuUszeVnQBcxSOw&sig2=WuFaJKlBFGVn0ckrWB1AhA

Answer 3

it will help u understand

Answer 4

Let \(x=\cos\dfrac{\pi}{12}\). Then \(x^2=\cos^2\dfrac{\pi}{12}\). Using the half angle identity,
\[\cos^2\theta=\frac{1+\cos2\theta}{2}\]
we have \(x^2=\dfrac{1+\cos\dfrac{\pi}{6}}{2}\). Find the value of \(\cos\dfrac{\pi}{6}\) and take the square root to find \(x\).

Answer 5

@javalos01 Ok! That did help a lot! Thank you :) There's a whole bunch of results for this on Google, but they're all different so I wanted to confirm.

@SithsAndGiggles Thanks!! That helped a bunch, too. I think I've got it now. Thank you both!!

Answer 6

i know thats a good one

Answer 7

hey ill fan u

Answer 8

Lol ok. Right back at 'cha ;)