Contact us
Choose a category below so we can get back to you as quickly as possible.
arctan可以吧因為是實軸上連續 lnx的定義域R+,sinx和x可能不同號,就不在定義域裡面了
We and our partners use cookies and other technologies to analyze traffic and optimize your experience. View more info and control your cookies settings at any time in our Cookies Policy.