余弦(cos)= 0 正切(tan)不存在 余切(cot)= 0 正割(sec)不存在 余割(csc)= 1 九十度的三角函数值如下: 正弦(sin)= 1 余弦(cos)= 0 正切(tan...
[摘要]:某人怎么了用英语怎么说(我要同义句,我记得有好几种说法)收...1、what happend to sb?whats wrong with sb?whats the matter with sb?2、hear from ...
[摘要]:0到100的英文单词是什么_作业帮zeroone two three four five six seven eight nine ten.eleven twelve thirteen fourteen fifteen sixteen seventee...