Question

What are the sine, cosine, and tangent of 5 pi over 4 radians?
i already know how to convert radians to degrees but im not sure where to go from there

Answer 1

so you have 225 degrees?

Answer 2

and do you know how to use the unit circle?

Answer 3

Kind of. I couldn't quite grasp the concept of it

Answer 4

ok, the unit circle is just a circle graph, it shows you the exact values of certain points at certain degress on the way around

Answer 5

so like with 225 degrees its going to read as \[ \frac{ 5\pi }{ 4 }\]

Answer 6

yes

Answer 7

So then how do i take that and put it in Sin, Cosine, and Tangent?

Answer 8

idk if you are this far, but sin=y, cos=x, and tan=y/x

Answer 9

so you are given the coordinates for 225 on the graph, and you just use them as an ordered pair

Answer 10

idk what just happened... ignore that please...

Answer 11

mmmkay, hope it helped

Answer 12

wait so if i have the coordinate points then i have two x's and two y's so which ones do i use and what do i do with them?

Answer 13

why would do you have two x's an y's?

Answer 14

pssshhhh my bad. im blind so then sine and cosine are both \[\frac{ -\sqrt{2} }{ 2 }\] and\[\frac{ -\sqrt{2} }{ 2 }*\frac{ 2 }{ -\sqrt{2} }\] is tangent

Answer 15

i got it :) thanks

Answer 16

np

Answer 17

and good job figuring it out