12. Given the function f(x)= **)Cos(x) , find the value of the first derivative at x = 2 . sin(x) (a) Use analytical differentiation by hand. (b) Use the four-point central difference formula with x_2 = 1.96 , x¡-1 = 1.98 , x+1= 2.02 , and X;+2 = 2.04 . %3D

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