y=(1+cosx)/(1-sinx)y(1-sinx)=1+cosxy-ysinx=1+cosxy-1=ysinx+cosx=√(y^2+1)*[y/√(y^2+1)*sinx+1/√(y^2+1)*cosx]=√(y^2+1)sin(x+α),其中cosα=y/√(y^2+1),sinα=1/√(y^2+1).所以,由 |y-1|=|√(y^2+1)*sin(x+...