Assuming Capital letters are angles, opposite legs are lower case

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> In triangle $XYZ$, $\cos X = 1/2,$ $\cos Y = -1/4$ and $x =6$. Find $y$ in simplest radical form.
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So far I have been using $\cos$ (adj/hyp) to create a possible ratio, but as you see am having trouble with the negative. Any pointers?

![enter image description here](https://i.stack.imgur.com/1MJB5.jpg)