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posted by Jane Thursday, December 1, 2011 at 10:17am.

Find the partial derivative for x. f(x,y)=1/SQRTx^2+y^2

treat y as a constant: f(x,y) = (x^2 + y^2)^.5 dy/dx = .5 (x^2 + y^2)^-.5 * (2x) = x/sqrt(x^2 + y^2)

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