Question

Assuming that u is in the interval (0,pi/2) and cos u=1/5 evaluate cos(u/2)
Enter an exact answer=?

Answer 1

let me get my calc

Answer 2

thnaks

Answer 3

i dont think decimals work

Answer 4

ok i got an aswer but i am not sure if that is what u want

Answer 5

wait a sec

Answer 6

ok

Answer 7

cos^-1(1/5)=u
u=78.4

Answer 8

cos(78.4/2)=.77

Answer 9

did u get what i did?

Answer 10

yes but i think it wants fraction

Answer 11

1/sqrt(2) =.707

Answer 12

it wants a fraction :( thanks anyway

Answer 13

well it won't go into a fraction so i picked one that is simular

Answer 14

idk it just says its wrong

Answer 15

wait so let me play around

Answer 16

ok

Answer 17

did u try 1/sqrt2

Answer 18

nah didnt work

Answer 19

idk i tried radians and in dgrees and i got similar answers that reused to go into a fraction

Answer 20

sqrt(2)/2 didnt work