Having trouble with 3D Trig question (1 Viewer)

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Hey guys,

Hope you've all enjoyed your holiday :)
I'm struggling to figure out how to solve this 3D Trig question.
I got the first part but I'm stumped for the second part. It's from the Cambridge 3U, Year 12.

Any help would be greatly appreciated. Thanks in advance :)

3D Trig - Cambridge 3U.png
 

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