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For questions investigating students mistakes, clarifying their origin and asking for advice to fix or improve the mistakes.

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A simple proof by contradiction answers your question 2. Suppose that the arc of the parabola $y=x^2$ between $A\;(1,1)$ and $B\;(-1,1)$, which touches the $x$ axis at the origin $O$, is also an arc o …
answered Mar 2 '15 by John Bentin