CPhill

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 #3
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+14

Have a look at this graph, Melody.

https://www.desmos.com/calculator/blatwtgdae

I have graphed the tangent line to the curve at (1/√2, 3/2)  and a line perpendicular to this one that goes through the same point. And the perpendicular line also goes through (0,2). And the shortest distance between a line and a point is a perpendicular line to the given line passing through that point....

{The same argument can be made for the other point (-1/√2, 3/2)...}

 

12.02.2015