《三角函数歌诀》歌词
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[00:00:00] 三角函数歌诀 - 洛天依
[00:00:06] 词:石伟
[00:00:12] 曲:石伟
[00:00:18] 一正二正弦
[00:00:21] 三切四余弦
[00:00:26] 奇变偶不变
[00:00:29] 符号看象限
[00:00:34] 余正号相反
[00:00:38] 正余号相同
[00:00:42] 切和除积差
[00:00:45] 切差除积和
[00:00:49] 正倍二正余
[00:00:53] 余倍平方差
[00:00:57] 切倍二正切
[00:01:01] 除一平方差
[00:01:06] 正三减四立
[00:01:09] 余三差四立
[00:01:13] 公式在这里
[00:01:17] 学数学容易
[00:01:38] 一正二正弦
[00:01:42] 三切四余弦
[00:01:46] 奇变偶不变
[00:01:49] 符号看象限
[00:01:54] 余正号相反
[00:01:58] 正余号相同
[00:02:02] 切和除积差
[00:02:05] 切差除积和
[00:02:10] 正倍二正余
[00:02:14] 余倍平方差
[00:02:18] 切倍二正切
[00:02:22] 除一平方差
[00:02:26] 正三减四立
[00:02:30] 余三差四立
[00:02:34] 公式在这里
[00:02:38] 学数学容易
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