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First find the stationary points of y = 2x- 0.5x - 12x; then classify them into local (global) minimal or maximal points. Find the

First find the stationary points of y = 2x- 0.5x - 12x; then classify them into local (global) minimal or maximal points. Find the first and second order partial derivatives of z = xy - In(x + y) + (x-3y)4. Find and classify the stationary points of the function f(x, y) = x+6x-3y - 23.

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