A parabola is the set of all points that are equidistant from a point and a
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A tree branch bending under the weight of snow :D.
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Parabolic curves and surfaces (paraboloids) occur in nature and by human activity in approximation. Due to external factors such as air friction, wind, and earth's rotation however,
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dy/dx = 0 at a turning point. dy/dx = 2  2*x. = 0 if x = 1. Turning point at x = 1 < d2y/dx2 = 2.negative, hence turning point is a maximum. Thus the curve is an upsidedown
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