画如下的函数x的区间(0,15)y=0.4045879*cosh(0.79304*x)*cos(0.79304*x)+ 0.3530811*sinh(0.79304*x)*sin(0.79304*x)
clc;
x=0:0.1:15;
y=0.4045879*cosh(0.79304*x).*cos(0.79304*x)+0.3530811.*sinh(0.79304*x).*sin(0.79304*x);
figure
plot(x,y);