Please help..............
![Please help class=](https://us-static.z-dn.net/files/d9b/56d99f54adeb7b4e71f7c8e686db4230.png)
Cosine=Adj/Hyp
You need to find the adjacent of z, which is YZ.
And the hypotenuse is XZ.
Answer:YZ/XZ