This type of problem occasionally appears on the JEE tests, which are required for admission into India's prestigious IIT colleges. This is a fun trigonometry problem--it tests your understanding of many concepts!

Source
2010 IIT JEE Paper 1, problem 29 via Khan Academy
https://www.khanacademy.org/te....st-prep/iit-jee-subj
https://www.youtube.com/watch?v=X7GT9JKoAbo

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