hi, i have a problem understanding why the wave equations are as such
if wave is moving left, it is
f(z,t) = Acos(kz + wt - d)
if wave moving right ,
f(z,t) = Acos(-kz -wt + d)
finally i don't know what this represent
f(z,t) = Acos(kz - wt + d)
where A is constant ,
k is wave...