Mathematics is one of the most difficult and important subjects. Many students love it, and many are afraid of it. Well, for ...

一、锐角三角函数 定义：锐角A的正弦(sin)、余弦(cos)、正切(tan)、余切(cot)、正割(sec)和余割(csc)统称为锐角A的三角函数。具体如下： 正弦(sin)：对边比斜边，公式为 sin A = a/c 余弦(cos)：邻边比斜边，公式为 cos A = b/c 正切(tan)：对边比邻边，公式为 tan A = a/b 余切 ...

To recognise his contributions to Singapore’s education landscape, NTU is conferring on Dr Tan an honorary doctorate degree As Singapore’s former Education Minister, Dr Tony Tan Keng Yam championed ...