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3. Use the two-path test to show that lim xzy (x.y)-(0,0) (x2+y)2 does not exist. 4. Consider the function f(u, v) = u3 - uv

3. Use the two-path test to show that lim xzy (x.y)-(0,0) (x2+y)2 does not exist. 4. Consider the function f(u, v) = u3 - uv + v2 where u = sinx + cosy and v = xey + yex. Find Of and af ax ay

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