Question

The angle x lies in the interval 2≤x≤pi, and sin² x = 8/9. Determine the value of cos x/2 and sin3x

Answer 1

i already got that part... would that mean that for cosx/2 i would so whatever cosx equals and then just divide it by two ? :S

Answer 2

yes

Answer 3

really? :S

Answer 4

mhm

Answer 5

so cos x = (r001)/(root)9... i would just to that over 2?

Answer 6

sorry i meant root1

Answer 7

yes

Answer 8

its wrong ):

Answer 9

what did you get?

Answer 10

got 1/6

Answer 11

but its (root3)/3