Two transverse sinusoidal waves combining in a medium are described by the wave functions
y1 = 1.00 sin ?(x + 0.500t)
y2 = 1.00 sin ?(x - 0.500t)
where x, y1, and y2 are in centimeters and t is in seconds.

(a) x = 0.220 cm
(b) x = 0.700 cm
c) x = 1.10 cm