POTW #4 - Jan. 21, 2024

Contributed by: herosoulz

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Difficulty: 8

This problem is tagged with potw, potw2024.

MCR Problem of the Week, Jan. 21, 2024 Edition

Solve for exact $\sin^2 18 + \cos^2 72$ in the form $\frac{a-\sqrt{b}}{c}$. Your answer should be submitted in the form: (a-sqrt(b))/c.

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