Part b require some thinking. I recommend students to always write down what they know from the given information. For example, when I first started doing this question, I wrote down y and x. Then thought to myself: how is this going to help me? It should help me get my answer. Then I looked at its relevance with regards to the angles inside right angled triangles I drew for myself. And slowly found my way to getting the answer.

Never give up a question just because it seems too difficult to answer! I’m always rooting for you!

Here’s a clearer pic