16.6 Exercise 12

Consider two wave functions $y \left(x , t\right) = 0.30 \text{cm} \text{sin} \left(3 \text{m}^{−1} x - 4 \text{s}^{−1} t\right)$ and $y \left(x , t\right) = 0.30 \text{cm} \text{sin} \left(3 \text{m}^{−1} x + 4 \text{s}^{−1} t\right)$. Write a wave function for the resulting standing wave.