And again, if I say, suppose I say eta is equal to h by 2 cos omega t, but x is equal to l
and that is; that gives me c 1 as h by 2 cos omega t c 1 will give me c 1 is. If it has
attacks is equal then my c 1 will be h by 2 cos omega t, h sorry h by 2 into j naught k l,
because cos omega t at x is equal to l this will be c 1 j naught k l, c 1 j naught k l is h by
2, so c 1 h by 2 j naught k l, and which implies by eta, if eta is this at x is equal to l then
that will. So my c 1 is this 1, c 1 is this my eta will be h by 2 j naught k x by j naught k l
into cos omega t, this is what the. If I am looking at a, this will be the general form of
this lesson. And this is alike, there is wave which will, here my channel will look like
this. This is at x is equal to l, and what x is equal to zero, this is the analyze like this, and
this is the wave, eta will look like, and it can seen that, this is a spherical, it is a
cylindrical waves, particularly for center wave, which decades at. Now in the same way,
I only not go today much into the details of, more about the waste potaline again
summarize few more simple cases. So, let me just say few things.