Looks like Wallis to me

Algebra Level 2

Given that f(x)=x2x21 f(x) = \frac {x^2}{x^2 - 1} , compute

51×[f(50)×f(49)××f(3)×f(2)]. 51\times \big[ f(50)\times f(49)\times \cdots \times f(3)\times f(2) \big].

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