Question

how would i find cos with the information given?

Answer 1

sin u =1/6 - so than sin^2 u=1/36

sin^2 u +cos^2 u=1 -- than 1/36 +cos^2 u =1 so than cos^2 u =1 - 1/36 = 35/36
- so than cos^2 u=35/36
cos u = +/- sqrt(35/36) = +/- (sqrt35)/6

Answer 2

what would the answer be thought? because sqroot 35 over 6 doesn't work.

Answer 3

sin^2 u +cos^2 u =1
1/36 +(sqrt35/6)^2 =1
1/36 + 35/36 =1
(1+35)/36 =1
36/36 =1
1=1

- why not is right ?

Answer 4

ok ?