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Given that z=f(x,y) where x=rcos and y=rsin. Find z/r and z/ Show that (z/x)^2 +...

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Finance

Given that z=f(x,y) where x=rcos and y=rsin. Find z/r and z/

Show that (z/x)^2 + (z/y)^2 = (z/r)^2 + (1/r^2)(z/)^2

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