how to plot cosx*coshx+1=0

clc
clear
close all

syms x 

f(x) = (cos(x))*(cosh(x))+1;

fplot(x,f)
xlim([0 10]);
ylim([-100 100]);

Why is the gragh cut off??

Answer 1

[the cyclist]

I don't have the Symbolic Math Toolbox, so I can't comment on your code. But this worked for me.

f = @(x) (cos(x)).*(cosh(x))+1;

figure
fplot(f)
xlim([0 10]);
ylim([-100 500]);