Question

PLEASE HELP ME!
FAN, MEDAL, TESTIMONY

Answer 1

I think its either A or C

Answer 2

@iambatman can you help me?

Answer 3

Yeah sure, you know your special triangles?

Answer 4

not familiar with em, no ):

Answer 5

@iambatman

Answer 6

@satellite73 please?

Answer 7

ok i see what we need to do
what is \[\large \pi-\frac{5\pi}{6}\]?

Answer 8

if that is confusing, think of it more simply as
\[1-\frac{5}{6}\]

Answer 9

@iambatman i always thought this "reference angle" stuff was a bunch of nonsense

Answer 10

You're probably right, but it's how we were taught in high school and it stuck around, I'm assuming most people just use it to remember trig stuff, and just to pass the course. But of course there's much more sense to doing such things the rational way if you will I guess.

Answer 11

in any case, \[\pi-\frac{5\pi}{6}=\frac{\pi}{6}\] and that is the "reference angle"

Answer 12

^

Answer 13

since you are in quadrant II
sine is positive, cosine is negative, and therefore tangent is negative as well

Answer 14

so it C! (: right?

Answer 15

yeah C as always

Answer 16

And the little CAST graph crap they teach to remember the trig functions in the quadrant rather than working through it..bleh.

Answer 17

cosine is the first coordinate, it is to the left, so negative
sine is the second coordinate, it is up, so positive
tangent is sine over cosine, therefore negative as well