[fgabertb]

function r=abc(x) %指定輸出是r
a=0.8;
b=0.6;
r=sqrt(a^2*b^2/(b^2*cos(x)^2+a^2*sin(x)^2)); %加分號


===========

>> c=abc(2*pi).*abc(2*pi)

c =

0.6400

試試看吧