Question

Can someone help me?
http://prntscr.com/5ow54v

Answer 1

I gave you the answer away, sorry

Answer 2

So its b?

Answer 3

yes

Answer 4

no , sorry it is not

Answer 5

\(\large\color{royalblue}{ \cos(\theta)=14/(14\sqrt{2}) }\) like this

Answer 6

so cos(theta) is
14/(14sqrt(2)) = 1/sqrt(2)
now you can multiply by sqrt(2)/sqrt(2)
and get
sqrt(2)/2

Answer 7

Oh okay. Thanks (:

Answer 8

yw