Can You Solve This Very Challenging Trigonometry Question?

All you need is some basic high school mathematics

This question is both simple and very challenging. It appeared on a Cambridge University Mathematics entrance paper in 1987. To answer it, you only need to to know some basic high school trigonometry. Here is the question:

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Keith McNulty

Keith McNulty

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Expert and Author in Applied Mathematics, Data Science, Statistics. Also writes History, Science, Culture. Find me on LinkedIn or Twitter or keithmcnulty.org