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A surface Sis dened by z : f(:|:, y) = $3 182:; + Sya. [7 Marks] i] Find the local maximum. the Local minimum and

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A surface Sis dened by z : f(:|:, y) = $3 182:; + Sya. [7 Marks] i] Find the local maximum. the Local minimum and the saddle point of the surface if exists. [7 Marks] ii} Estimate the value of 2 on S when x = 1.2, y = 2.8 using the approximation of tangent plane at (1,3, 0)

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