"余弦"是个多义词,它可以指余弦(三角函数的一种),余弦(上海大学教授)。
假设我们同时绘制正弦和余弦曲线。
我还听到了余弦,还有正弦。
你不可以使用高级三角知识 例如正弦 余弦等.
You may not use more advanced trigonomery, such as the law of sines, the law of cosines, etc.
You've got to know your trigonometry, you've got to know what's a sine and what's a cosine.
你们得懂三角学,你们得知道什么是正弦什么是余弦
And they tried to run it, and it ran a long time.
他们又去试了试余弦,也不行。
Then you're supposed to know derivatives of simple functions like sines and cosines.
你应该知道一些简单函数的导数,比如正弦函数和余弦函数
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