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 ...

Get up and running with ChatGPT with this comprehensive cheat sheet. Learn everything from how to sign up for free to enterprise use cases, and start using ChatGPT quickly and effectively.

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