Question

Find the exact value of the trigonometric ratio. Use the unit circle.
cos5π/3

Answer 1

unit circle is in coordinates x,y

Answer 2

cos = x, sin = y

Answer 3

A good way to solve it is using symmetry and remembering something cool about the cos function; that \[\cos -x=cosx\] Hopefully this helps you visualize it

Answer 4

I'm still lost on what I'm suppose to do..

Answer 5

Do you know what radians are?

Answer 6

yes

Answer 7

So you know the basic values like 30* is pi/6 and 60* is pi/3?

Answer 8

Maybe I don't really understand radians then

Answer 9

basically it is just an alternate way of representing angles, but instead of degrees, it's fractions of the circumference of a circle with radius 1