(a) Estimate the values of f, fa and fy at the point (, y) = (0.6,0.4). (b) What is the equation for the tangent plane to the graph of f at the point corresponding to (x, y) = (0.6,0.4)? (c) Estimate fe, fry, fya and fyy at the point (x, y) = (0.6, 0.4). ৪ 0.6 -100 -86 0.4 -71 -57 42 16 103 -13 30 -28 -13 16 -13 1 0.2 16 30 16 y 74 45 30 -0.2 16-16 13 -13 16 -0.4 -28 30 -0.6 -1 -0.8 -0.6 -0.4 -0.2 0.2 0.4 0.6 0.8 132 11 -187- -172- 158- 13-

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