Question

help!! medal given ! use the figure to find the exact value of each trigonometric function.
cos x/2

Answer 1

thank you!! for coming i really need help

Answer 2

Im only in 8th grade this doesnt look like something i can do

Answer 3

@Directrix can you help me?

Answer 4

Have you studied the half angle formula for cosine?

Answer 5

i don't understand either

Answer 6

yes

Answer 7

i have studied the half angle formula for cosine

Answer 8

@Directrix

Answer 9

haven't learned it yet.

Answer 10

Please post it so that we can use it.

Answer 11

cos aplha/2=square root 1+cosaplha over 2

Answer 12

let me try to draw it

Answer 13

\[\sqrt{\frac{ 1+\cos \alpha }{ 2 }}\]

Answer 14

Are we using the left or the right triangle for this problem?

Answer 15

the left triangle

Answer 16

In the left triangle, what is the value of cos(theta) ?

Answer 17

Look at the attached chart.

Answer 18

cosine of an angle is the adjacent leg over what?

Answer 19

so it'll be 4/5

Answer 20

@Directrix what do i do after?

Answer 21

Fill in the half angle formula you posted