Find and classify all the stationary points of f(x, y) = x + y - 2x...

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Find and classify all the stationary points of f(x, y) = x² + y² - 2x² + 4xy – 2y² (Use alternative means if the usual method gives an inconclusive result.) Find and classify all the stationary points of f(x, y) = x² + y² - 2x² + 4xy – 2y² (Use alternative means if the usual method gives an inconclusive result.)