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📌 Necessary & sufficient condition for limit.
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📌Sufficient condition for differentiability.
📌 Euler's Theorem
📌 General form of Eular's equation
📌 Euler's Theorem for 3 variables
(Q) Let z be a differentiable function of x & y and let x=rcosθ , y=rsinθ. Prove that (∂z/∂r)² + 1/r²(∂z/∂θ)² = (∂z/∂x)² + (∂z/∂y)²
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