If x = x2 - x y + y3, x = rcosθ, y = rsinθ then \(\left(\frac{\partial z}{\partial r}\right)_{x=1, y=1}\) equals

1
\(\frac{3}{\sqrt2}\)
2
\(\frac{1}{\sqrt2}\)
3
\(\sqrt2\)
4
1

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