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

Calculus 
Steve
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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