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My prof tells me to maximize my range by differentiating the function. My calculus is a bit rusty could someone refreshen my memory of how to do this? I believe i am solving for α.

(dΔx/ dα) = 0 , (-tanα)Δx = ViSinα(Δx / ViCosα) - 1/2g(Δx/ViCosα)^2