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- 6 A curious geometry problem: Find the $\angle OBC$
- 5 Did I apply the Ceva's theorem correctly to this problem?
- 5 If $\sin 5°+\sin 10°+\sin15°+\cdots+\sin 40°=a$, then $\sin 5°+\sin 10°+\sin15°+\cdots+\sin 175°=?$
- 5 What is the mathematical meaning of this question?
- 5 Find the exact value of trigonometric expression: $ \arctan\frac{2\cos \frac{\pi}{30} \cos\frac{\pi}{15}}{1+2\cos \frac{\pi}{30} \sin\frac{\pi}{15}}$?
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