Trigonometry and goniometry maths equations and word problems

I am looking for a skilled mathematician who can assist me with a project involving trigonometric equations. I have a mathematics advent calendar with 21 total questions. I need the solutions explained step-by-step, and the difficulty level of the problems is intermediate.

Skills and experience needed:
- Strong knowledge of trigonometry and goniometry
- Experience solving trigonometric equations
- Ability to explain solutions step-by-step in a clear and concise manner
-Example question attached