EasyCurves in space

Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) §12.2 Plane Motion: Projectiles and Cycloids, #8 · Multivariable Calculus · Curves in space

How far out does the same stone go, starting at angle

How far out does the same stone go, starting at angle $α$ ? Find an equation for the angle that maximizes the range.

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Gilbert Strang, Calculus, 3rd edition (Wellesley-Cambridge Press; MIT OpenCourseWare RES.18-001) · §12.2 Plane Motion: Projectiles and Cycloids, #8

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