看板 Math 關於我們 聯絡資訊
※ 引述《hero010188 (咖啡乾了啦)》之銘言: : https://i.imgur.com/X3fobVl.jpg
theta = 2k sin(2k) + cos(2k) - 1 = 2sin(k)cos(k) - 2sin(k)sin(k) = 2sin(k)[cos(k) - sin(k)] 1 - sin(2k) + cos(2k) = 2cos(k)cos(k) - 2sin(k)cos(k) = 2cos(k)[cos(k) - sin(k)] LHS = tan(k) = sin(k)2cos(k) / [cos(k)2cos(k)] = sin(theta) / [1 + cos(theta)] -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 111.241.148.79 (臺灣) ※ 文章網址: https://www.ptt.cc/bbs/Math/M.1567848128.A.64E.html
Honor1984 : = RHS 09/07 17:22
hero010188 : 厲害 09/07 17:39