Find the best quadratic approximation to f(x,y) = e5ycos(-4x) about the origin (0,0) and estimate the value...

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Find the best quadratic approximation to f(x,y) =e5ycos(-4x)about the origin (0,0) and estimate the value when thisapproximation is used to calculate f(0.1,0.1).Donot do the error approximation. Also, find the extremevalues of the function f(x,y,z) =8y2-4xz +16z - 35 on the surface2x2+4y2+4z2= 32

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