Question: answer 19. Given that f is a differentiable function with f(2, 5) = 6. f. (2. 5) = 1. and f, (2. 5) = -

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19. Given that f is a differentiable function with f(2, 5) = 6. f. (2. 5) = 1. and f, (2. 5) = - 1, use a linear approximation to estimate f(2.2, 4.9). 20. Find the linear approximation of the function f(x.y) = 1 - xy cos try at (1, 1) and use it to approximate f(1.02.0.97). Illustrate by graphing f and the tangent plane. 21. Find the linear approximation of the function f(x. y.z) = vx' + y' + z' at (3, 2, 6) and use it to approximate the number (3.02)? + (1.97) + (5.99)

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