Question

When Θ = 5 pi over 6, what are the reference angle and the sign values for sine, cosine, and tangent?

Θ' = negative pi over 6; sine and cosine are positive, tangent is negative.
Θ' = 5 pi over 6; sine and tangent are positive, cosine is negative
Θ' = pi over 6; sine is positive, cosine and tangent are negative
Θ' = negative 5 pi over 6; sine is positive, cosine and tangent are negative
@satellite73 plz help

Answer 1

i think it's C but not sure

Answer 2

i never know about reference angles but i bet we can figure it out

Answer 3

ok

Answer 4

i have to look it up
i think it may be C too

Answer 5

yeah go with C

Answer 6

ok

Answer 7

reference angles the stupidest damn thing
no use at all

Answer 8

haha how i feel about math all the time xD

Answer 9

yeah even on christmas eve!
don't you ever take a break?

Answer 10

i dont celebrate it lol

Answer 11

do u know the answer?

Answer 12

yeah it is C

Answer 13

wow i thought I was the only one who didn't use reference angles

Answer 14

it is ridiculous

Answer 15

I use reference angles...

Answer 16

spend more time figuring out the "reference" when you can just use the unit circle

Answer 17

Well, then again I already know what they are haha.

Answer 18

just curious when you would use it
would you use it to find \(\cos(\frac{5\pi}{6})\) and if so, how?

Answer 19

\[\cos(\frac{5\pi}{6})=-\cos(\frac{\pi}{6})\]

Answer 20

too many rules, just look at the unit circle or do it menally

Answer 21

I just refer back to Q1 to find \(\cos\left(\frac{\pi}{6}\right)\) to either find my angle measure or the cosine or sine value correlated with it, just to cross check.

Answer 22

I've gotten so used to referring back to Q1 to crosscheck my values I guess it's become a habit.

Answer 23

it always scares me when someones picture changes in the middle of a thread

Answer 24

Haha, It was @Zale101's gift to me this year, had to use it.

Answer 25

The stupid way that we were taught about reference angles for this was when you have something such as 5pi/6 you could find the reference angle by just doing this