Find all stationary points and classify them (local and global). a f(x, y) = (4x -...

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Find all stationary points and classify them (local and global). a f(x, y) = (4x² - y)². b f(x, y) = 2x² + 3y²– 2xy + 2x − 3y. c f(x, y, z) = x² - 2x² + y² + 2yz + 2z². Find all stationary points and classify them (local and global). a f(x, y) = (4x² - y)². b f(x, y) = 2x² + 3y²– 2xy + 2x − 3y. c f(x, y, z) = x² - 2x² + y² + 2yz + 2z².