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Find all stationary points and classify them (local and global). a f(x, y) = (4x - y). b f(x, y) = 2x + 3y

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

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