I need help with this problem I keep getting it wrong.

Tutorial Exercise Two traveling sinusoidal waves are described by the wave functions y1 = 4.51 sin [n(3.62x - 1228t)] y, = 4.51 sin [n(3.62x - 1228t - 0.250) ] where x, y, , and y, are in meters and t is in seconds.Part 3 of 3 - Analyze The sum of two wave functions y, and y, traveling in the same direction having the same amplitude A, angular frequency w and wave number k but differing in phase, have the resultant wave function y = y1+ /2 = 2Ag Cos (2 ) sin ( kx - cut - where 4 is the phase constant that determines the phase difference between y, and y, based on their initial conditions. (a) The amplitude of this resultant wave is A =2A Cos 2 2( 5 X = Your response differs from the correct answer by more than 10%. Double check your calculations. m ) cos 10.9 X Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. It) 10.1 X Your response differs from the correct answer by more than 10%. Double check your calculations. m, (b) and its frequency is f = 2 It 1243 IT S-1 = 621.5 Hz