[00:00.00]90听音乐网 www.90T8.com [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
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[00:00.00]90听音乐网 www.90T8.com[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
