Ed, I have a beautiful log log slide rule that does sine/cosine too. Its in a very, very dusty drawer somewhere
One of mine is a Dietzgen Log Log Decitrig, another is a Keuffle & Esser Log Log Vector and my 3rd is Pickett made USAF Aerial Photographic. To have used slide rules, one must be of a vintage age like I am. The nice think about what I have is that I've still got the manuals.
More like a secant, cutting through the middle. When one doesn't know how to do the pencil - button - P.E.T.E. exercise properly what difference does it make to continue beating a dead subject. Such are those that don't last long lifting barbells also.