MHB What are the best resources for solving trigonometric equations and identities?

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For solving trigonometric equations and identities, users recommend utilizing resources like solved problems and comprehensive trig/pre-calculus textbooks. Engaging with textbooks allows for a structured approach, encouraging users to post questions as they progress. A specific resource shared is a link to a developed guide that helps streamline the learning process. These resources collectively support a better understanding of trigonometry. Effective study methods and community engagement are emphasized for mastering the subject.
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As per the guidelines, I've come here to ask if anyone knows of any good resources regarding trigonometry. Mainly solving equations and identities.
 
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There are a lot of solved problems here. If that's not what you're after, you could get a trig/pre-calculus textbook and work through it, posting any question you have along the way. :)
 
Also check out this https://mathhelpboards.com/threads/trigonometry-to-memorize-and-trigonometry-to-derive.35/ that I developed. It can narrow down your efforts considerably!
 
Here is a little puzzle from the book 100 Geometric Games by Pierre Berloquin. The side of a small square is one meter long and the side of a larger square one and a half meters long. One vertex of the large square is at the center of the small square. The side of the large square cuts two sides of the small square into one- third parts and two-thirds parts. What is the area where the squares overlap?

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