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- show that nth derivative of f(x)=x^2/(2x+1)(2x+3)What is the numerical approximation of the derivative of the function f(x) = x^3 - 2x + 1 at x = 2 using the forward difference formula with a step size of h = 0.1?find the critical points and apply the Second Derivative Test (or state that it fails). f (x) = xe−x2