Solving Ordinary Differential Equations using ode45 in MATLAB of a damped pendulum

Objective: the given ode of the damped oscillation is as follows to solve it we first simplify it using theta=x1; (d(theta))/dt= (dx_1)/dt =x_2; (d^2 (theta))/(dt^2 )= (dx_2)/dt; substituting we get: `(dx_2)/dt= -b/m x_2-g/L sin⁡(x_1)` also we know that (dx_1)/dt =x_2 solving using ode45 in matlab…