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Find the best quadratic approximation to f(x,y) = e4ycos(-3x) about the origin (0,0) and estimate the value...

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Advance Math

Find the best quadratic approximation to f(x,y) =e4ycos(-3x) about the origin(0,0) and estimate the value when this approximation is used tocalculate f(0.1,0.1).Do not do the errorapproximation. Also, find the extreme values of the functionf(x,y,z) = 8y2-4xz +16z - 35on the surface2x2+4y2+4z2= 64

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