The following is an initial value, second-order differential equation: d 2x dt 2 1 (5x) dx dt 1 (x 1 7) sin(vt) 5 0 where dx dt (0) 5 1.5 and x(0) 5 6 Note that v 5 1. Decompose the equation into two fi rst-order differential equations. After the decomposition, solve the system from t 5 0 to 15 and plot the results.