Re: LF: something for the weekend ??

["Rik Strobbe" <rik.strobbe@fys.kuleuven.ac.be>]

Hello Alan,

> Hi Andy, I am afraid my Terman "Radio Engineers Handbook"  1943 Page 19
> gives
>
>  Sin(A).Cos(B)= Sin(A-B)+Sin(A+B) ....if we forget about the 0.5  factor.
But Andy took  Cos(A)*Sin(B) instead of Sin(A)*Cos(B)
So if we swap A and B in your formula we come to : Sin(B-A) + Sin(B+A) = 
Sin(B+A) + Sin(B-A)
If we put that back to the "A first - B last" it becomes : Sin(A+B) + 
Sin(-A+B) = Sin(A+B) - Sin(A-B)
This last is what Andy gave.

73, Rik  ON7YD