如何用Matlab画出y=e的2x次方/x方得图像答:clc;clear syms x e=exp(1);y=(e^x+e^(-x))/2;a=limit(y,x,0);b=limit((y-a)/x,x,0);xx=linspace(-2,2,100);yy=(e.^xx+e.^(-xx))/2;yyjj=a+b*xx;plot(xx,yy,'b-',xx,yyjj,'r-.')box off grid on xlabel('x')ylabel('y')legend('y=(e^x+e^({...