Two harmonic waves are described by
y1 = A sin(3 x - 5 t),
y2 = A sin(3 x - 5 t - 4),
where A = 22 m, with x and t being given in SI units and the phase angles in radians. What is the displacement of the wave produced by interference of these two waves at x = 1 m, t = 1 s?