1. The problem statement, all variables and given/known data Hey, For an assignment I need to derive the optimal angle for maximum range (derive Equation 2 below). I know how to derive equation 1 but I need to derive the second equation so I can substitute h = 0, and h = 1, into it, to show the optimal angle for maximum range for bi-level and uni-level. I have a book that explains it but I don't understand it at all. Any help is really appreciated. Thank you! 2. Relevant equations Equation 1: Rmax = u^2 / g √(1 + 2gh/u^2) Equation 2: tan θ = 1 / √ (1 + 2gh / u^2) u = initial velocity g = grav. accel. h = height 3. The attempt at a solution One method I have tried is finding the derivative of Rmax, setting it to zero and solving for theta (to find the minimum) which does give me 45 degrees but I cannot apply this to bi-level projection.