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- 7. Find the linear approximation of the function f (x, y) = у - 1 at (0,0)Find all the second-order partial derivatives of the function f(x, y ) = ?²? + cos y + x sin y.let f be a function with f(0)=1 and f(x)=cos(x2) a) find the linearization of f at x=0 b) estimate the falue of f at x=0.1 c) do you think the actual value of f at x=0.1 is greater or less than the estimate in part b? explain