if i need to find t from Vs = 5 sin (2pi ft - pi/3) sorry i dont have the equation written as it should be

so far i have Vs/5 - sin (2pi ft - Pi/3)

move sin to the left and becomes a negative - asin (vs/5) = 2pi ft - pi/3

asin (vs/5) + pi/3 = 2pi ft

now i can start to find t ? is this ok so far?