Consider the following difference operators, show that they approximate the corresponding differential operator up to second-order accuracy

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Consider the following difference operators, show that they approximate the corresponding differential operator up to second-order accuracy 

(i) d f dx2  = 2f(xo) - 5f(xo - Ax) + 4f(x - 24x) - f(xo - 34x) 4.x + 0(4x)

(ii) a2 f  = [f (xo + x, yo + y) - f(xo + x, yo - ) - f (xo-Ax), yo+)+f(x-x, yo- )]/(41 ) +0(4x) + 0(Ay).

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