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lim(xto1) ((x^2-1)sin^2(pi x))/(x^4-2x^3...

`lim_(xto1) ((x^2-1)sin^2(pi x))/(x^4-2x^3+2x-1)` is equal to

A

`2 pi^2`

B

`pi^2`

C

`3 pi^2`

D

`pi^2/2`

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