Lim(xrarr0)(f(Cosx))/(x^2) =? where f(x...

`Lim_(xrarr0)(f(Cosx))/(x^2) =? ` where `f(x) = (1-x)/(1+x)`

A

`1/4`

B

`1/5`

C

`1/2`

D

`1/3`

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