看看,春小树有多无耻:
https://www.bilibili.com/video/BV1FK421y7b7/?spm_id_from=333.1007.tianma.1-1-1.click&vd_source=af7da46868fe264e2c0c0d8750e0868b
就从调和级数,三等分角,开始证明:
https://www.bilibili.com/video/BV1FK421y7b7/?spm_id_from=333.1007.tianma.1-1-1.click&vd_source=af7da46868fe264e2c0c0d8750e0868b
就从调和级数,三等分角,开始证明: