. Let f be a function of two variables such that and f(2, 1) = 4. af Ət If, in addition, x = r cost and y = r sint, find the value of when (r, t) = (2,5). 1. f(x, y) = (3x² - 3y, −3x + 3y²) 2. 3. Use the linearization of f at (2, 1) to estimate the value of f(2.02, 0.99). Find the critical points of f, and determine if f has a relative maximum, a relative minimum, or a saddle point at each critical point.

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