matlab解方程画图2*tan(0.5*sqrt(8*x^2-y^2))/(sqrt(8*x^2-y^2))-tan(

ezplot('2*tan(0.5*sqrt(8*(4*pi*sqrt(8.854*4*pi*10^(-19))/f)^2-y^2))/(sqrt(8*(4*pi*sqrt(8.854*4*pi*10^(-19))/f)^2-y^2))-tan(sqrt((4*pi*sqrt(8.854*4*pi*10^(-19))/f)^2-y^2))/sqrt((4*pi*sqrt(8.854*4*pi*10^(-19))/f)^2-y^2)=0',[0,40])
不过图貌似不太好啊!0