如

会被截断

![AAA](//i.upmath.me/svg/%5Cbegin%7Btikzpicture%7D%5Bdomain%3D0%3Api%2F2%2B1%5D%0A%5Cdraw%5Bvery%20thin%5D%20(-0.1%2C-0.1)%20grid%20(3.1%2C3.1)%3B%0A%5Cdraw%5B-%3E%5D%20(-0.2%2C0)--(3.2%2C0)%20node%5Bright%5D%20%7B%24x%24%7D%3B%0A%5Cdraw%5B-%3E%5D%20(0%2C-0.2)--(0%2C3.2)%20node%5Babove%5D%20%7B%24y%24%7D%3B%0A%5Cdraw%20plot%20(%5Cx%2C%7Bsin(%5Cx%20r)%7D)%20node%5Bright%5D%20%7B%24y%3D%5Csin%20x%24%7D%3B%0A%5Cdraw%5Bcolor%3Dblue%5D%20plot%20(%5Cx%2C%5Cx)%20node%5Bright%5D%20%7B%24y%3Dx%24%7D%3B%0A%5Cend%7Btikzpicture%7D)

这个链接有括号不会被截断

![BBB](//i.upmath.me/svg/%5Cbegin%7Btikzpicture%7D%5Csmall%0A%5Cdef%5Cr%7B1.8%7D%0A%5Ccoordinate%5Blabel%3D%24A%24%5D%20(A)%20at%20(0.5*%5Cr%2C0.8*%5Cr)%3B%0A%5Ccoordinate%5Blabel%3Dbelow%3A%24B%24%5D%20(B)%20at%20(-%5Cr%2C0)%3B%0A%5Ccoordinate%5Blabel%3Dbelow%3A%24C%24%5D%20(C)%20at%20(%5Cr%2C0)%3B%0A%5Cdraw%5Bthin%5D%20(A)%20--%20node%5Babove%5D%20%7B%24c%24%7D%0A%20%20%20node%5Bpos%3D0.03%2Cbelow%2Cinner%20sep%3D4%5D%20%7B%24%5Calpha%24%7D%0A%20%20%20(B)%20--%20(C)%20--%20node%5Bright%5D%20%7B%24b%24%7D%20(A)%3B%0A%5Cend%7Btikzpicture%7D)