So the equation is
f(x,t) = f(x-vt,0) = A sine k(x-vt).
Now Since x is displacement of wave from origin, t is time taken for that,wouldn't 'x-vt' always be equal to 0 ?
If x-vt is 0,
Y = A sine k(x-vt) will also be zero.
So am I writing the equation wrong?