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What is the function corresponding to a curve which looks like the following: enter image description here

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up vote 4 down vote accepted

$$ y=50-49\sqrt{1-x^2} $$ $ $ $ $ $ $

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Good guess. I was thinking of $(7x)^2+1$ but yours captures the vertical tangent at $x=1$ – robjohn Mar 5 '12 at 17:38

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