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September 23, 2014

September 23, 2014

Posted by **jump** on Sunday, September 30, 2012 at 2:38pm.

- cal -
**Reiny**, Sunday, September 30, 2012 at 3:41pmif y = 1/x

then dy/dx = -1/x^2

so -1/x^2 = -4

x^2 = 1/4

x = ± 1/√2

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