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problem) show that the shortest distance between two points in three dimensional space is a straight line?

problem) Finding the shortest path between any two points on the surface of a sphere but use the method of the Euler equations with an auxiliary condition imposed?

problem) Find the shortest path between the (x,y,z) points (0,-1,0) and (0,1,0) on the conical surface z=1-(x2+y2)1/2 what is the length of the path?

problem)

(a) Find the curve on the surface z=x3/2 joining the points(x,y,z)=(0,0,0) and (1,1,1) has the shortest arc length?

(b) Use a computer to produce a plot showing the surface and the shortest curve on a single plot?

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