How to plot this function with the interval of [-2,2]?

Answer 1

[Clay Swackhamer]

% Define x
x = linspace(-2,2,1000);

% Define function
y = x + 1-2*sin(pi*x);

% Estimate roots as values less than a tolerance
tol = 0.01
ix = find(abs(y)<tol)

% Plot function
plot(x,y)
hold on

% Plot roots
plot(x(ix), y(ix), 'ro')

% Add legend
legend('F(x)', 'Roots')

Answer 2

[Star Strider]

Use fimplicit —

syms x 
f(x) = x + 1 - 2*sin(pi*x)

f(x) = 

figure
fimplicit(f, [-2 2])
grid
xlabel('x')

.