arccscx的导数是反余切函数的导数。y=arccscxcscy=xsiny=1/x求导：ycosy=-1/x^2y=-1/(x^2cosy)=-1/(x^2√(1-sin^2(y)))=-1/(x^2√(1-1/x^2))=-1/(x√(x^2-1))