Question #217525
If (𝑎,𝑏) is any point of domain of definition of 𝑤(𝑢,𝑣) such that 𝑤𝑢 exists at (𝑎,𝑏) and 𝑤𝑣 is continuous at (𝑎,𝑏) then prove that 𝑤 is differentiable at (𝑎,𝑏).
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