how can we find the phasedifference between two phase? please say me all the method of finding phase difference

The phase difference is the fraction of a complete cycle corresponding to an offset in the displacement between two sine waves.
If you have time difference Dt, and you already know period of oscillations T, then corresponding phase difference is simply:
phi = 2 pi (Dt / T)
Thanks & Regards
Mukesh Sharma
askIITians Faculty