Answer Happy

Please help, I don't know why my answer is wrong!
A transverse wave on a string is described by the following wave function. (x + 3nt) 11 where x and y are in meters and t is in seconds. (a) Determine the transverse speed at t = 0.190 s for an element of the string located at x = 1.80 m. -0.726 x Note that you are asked to give the speed not the velocity. m/s y = 0.115 sin