Displacement of a particle (y)=rsin(wt-theta), where w=angular velocity,t=time.

Find the velocity and acceleration.

P.S.- Take wt-theta as ‘u’

Velocity= dy/dt =rw cos( wt-u) and acceleration= dv/dt= -rw²sin(wt-u). Please do approve my answer if correctly solved and represented { i have taken theta as "u"}