7.1 Determine the resultant of the superposition of the parallel waves $E_1 = E_{01} \sin(\omega t + \epsilon_1)$ and $E_2 = E_{02} \sin(\omega t + \epsilon_2)$ when $\omega = 120\pi$, $E_{01} = 6$, $E_{02} = 8$, $\epsilon_1 = 0$, and $\epsilon_2 = \pi/2$. Plot each function and the resultant.