[id:$00000000] [ar:石伟] [ti:三角函数歌诀] [by:] [hash:2f7ae9d97dae3fdb39e6ef2194597b66] [al:] [sign:] [qq:] [total:0] [offset:0] [00:01.75]词：石伟 [00:02.39]曲：石伟 [00:03.03]编曲：石伟 [00:18.04]一正二正弦 [00:22.09]三切四余弦 [00:25.93]奇变偶不变 [00:29.94]符号看象限 [00:33.93]余正号相反 [00:37.92]正余号相同 [00:41.94]切和除积差 [00:45.91]切差除积和 [00:50.15]正倍二正余 [00:53.79]余倍平方差 [00:57.78]切倍二正切 [01:01.96]除一平方差 [01:06.03]正三减四立 [01:09.90]余三差四立 [01:13.80]公式在这里 [01:17.95]学数学容易 [01:38.22]一正二正弦 [01:41.72]三切四余弦 [01:46.02]奇变偶不变 [01:49.81]符号看象限 [01:53.54]余正号相反 [01:57.59]正余号相同 [02:01.83]切和除积差 [02:06.00]切差除积和 [02:10.06]正倍二正余 [02:13.68]余倍平方差 [02:17.77]切倍二正切 [02:21.63]除一平方差 [02:25.93]正三减四立 [02:29.96]余三差四立 [02:33.93]公式在这里 [02:37.94]学数学容易