摘要： (Murty, 1982 June)证明或否证\[\tan \frac{3\pi}{11}+4\sin \frac{2\pi}{11}=\sqrt{11}.\] 令$x=e^{2\pi i/11}$,则\[2\left( 2i\sin \frac{2\pi}{11} \right) =2\left( 阅读全文