Top network posts

• 20 Is this $2020$ holiday formula correct? $\pi\left( \dfrac{\left( \pi!\right)!-\lceil \pi \rceil \pi! }{{\pi}^{\sqrt \pi}-\pi!}\right)=2020$
• 18 Why should it be $\sqrt[3]{6+x}=x$?
• 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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