What is the second difference that is used to replace the second order derivate of y(t)?

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answerhappygod
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What is the second difference that is used to replace the second order derivate of y(t)?

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a) [y(n)-2y(n-1)+y(n-2)]/T
b) [y(n)-2y(n-1)+y(n-2)]/T2
c) [y(n)+2y(n-1)+y(n-2)]/T
d) [y(n)+2y(n-1)+y(n-2)]/T2
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