The critical point of the function* f(x, y) = x² + 5y² + 2 cos x

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Q: 2) Let f(x) = x' +x² – 5x – 5. Use the second derivative test to classify the critical points.

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Q: Find the linear approximation of the function f (x,y) = ln (x - 3y) at point (7,2).

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