Find the time variation of the angular displacement of a simple pendulum (i.e., the solution of Eq.

Question:

Find the time variation of the angular displacement of a simple pendulum (i.e., the solution of Eq. (13.5)) for $g / l=0.5$, using the initial conditions $\theta_{0}=45^{\circ}$ and $\dot{\theta}_{0}=0$. Use the RungeKutta method given in Program18.m.

Equation 13.5:-