Yeah... ah... thanks!
Well, I have to stretch my brain way back to high school trig days. I used to be a math major. Something happened …. (life) and I seem to forget most of this stuff. I started taking calculous in high school (early) and when I got to go back to college like 11 years later, I did not prepare. So the college entrance exam left me knowing all that I don't remember! and humbled.
Now add a few more decades to that and I can't even follow the equation properly. Maybe I'll just draw it out......