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SMO 2019 Open Round 1 Question 3

SMO · SMO 2019 Open Round 1

Question 3

Assume that $0\lt \alpha\lt \frac\pi2$ and $\cos(\alpha+\frac\pi6)=\frac45$. Determine the smallest possible integer $R$ such that $100\sin(2\alpha+\frac\pi{12})\lt R$.