MathGroup Archive 1998

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polar coordinates

Dear Sirs,
Let me know the way to work with patial differentiation on polar
For examples, when
x = r Cos[q] and y = r Sin[q]
how can you obtain
du[x,y]/dx = Cos[q] * (du[x,y]/dr) - Sin[q] / r * (du[x,y]/dq) by
Thank you in advance.


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