Two waves on one string are described by the wave functions
y1 = 2.5 cos(3.5x - 1.5t)
y2 = 3.5 sin(4.5x - 1.5t)
where x and y are in centimeters and t is in seconds. Find the superposition of the waves y1 + y2 at the following points. (Remember that the arguments of the trigonometric functions are in radians.)
(a) x = 1.00, t = 1.00
cm

(b) x = 1.00, t = 0.500
cm

(c) x = 0.500, t = 0
cm