what is the problem

x=0:0.1:6;
fx=exp(x)*sin^2*(x);
plot(x,fx,'linewidth', 1.5)
xlabel('x','fontweight','bold','Fontsize',15)
ylabel('fx','fontweight','bold','Fontsize',15)
set(gca,'fontsize',15)
set(gcf,'color','w')
title('fx vs x')
axis square

Answer 1

[Star Strider]

Two problems, actually.

Use element-wise muultiplication and exponentian operators:

fx=exp(x)*sin^2*(x);
         ↑ ← HERE

and use the correct call to the sin function and use element-wise exponentiation operator:

fx=exp(x)*sin(x)^2;
                ↑ ← HERE

producing the correct expression:

fx=exp(x).*sin(x).^2;

See Array vs. Matrix Operations for details. .

Answer 2

[Alan Stevens]

You need to replace fx by

fx=exp(x).*sin(x).^2;

Answer 3

[naddin Jr. Julius Peter]

x=0:0.1:6;

fx=exp(x)*sin^2*(x);

plot(x,fx,'linewidth', 1.5)

xlabel('x','fontweight','bold','Fontsize',15)

ylabel('fx','fontweight','bold','Fontsize',15)

set(gca,'fontsize',15)

set(gcf,'color','w')

title('fx vs x')

axis square