slope shots
Neat idea with the cosine...thanks for that one. In short, it does not matter if you are shooting uphill or downhill; your shot will be high if you think of the slope distance ( hypotenuse). Gravity only matters on the horizontal ( shorter distance.)
You can go high tech, and use a rangefinder that has the built-in ARC calculation.....or a rough and ready one that I have used for many years with bow and rifle. For rifle, at longer distances...just subtract 100 yards from the estimation; for bow, subtract 10 yards ( one pin less)
Yes, the purists will point out velocity and other items...but I've put meat in the freezer with that simple system...give it a try...Good hunting to you...