QUOTE(Silent-Viewer @ Jul 29 2008, 12:14 PM) [snapback]2999383[/snapback]
This solution is based on the observation that two sinewaves of equal amplitude but differing phase have a maximum absolute sum where they intersect; this is shown by the fact that their slopes are equal in terms of |dy/dx| at the intersection, and as you move away, the decreasing function has a steeper slope than the increasing one. Any time that happens, you have a maximum sum.
So we can say in this case that each amplitude = 0.725A. Then half the phase difference Δθ/2 = arccos(0.725) = 0.759762 rad; Δθ = 1.5195 rad = 87.06 deg = 0.2418λ.
link bhi de daitey na,,,,,, jahan se copy paste mara hey