if f (x) = lim (x to oo) (prod(i=l)^(n )...

if `f (x) = lim _(x to oo) (prod_(i=l)^(n ) cos ((x )/(2 ^(l))))` then f '(x) is equal to:

`(sin x)/(x)`

`(x)/(sin x)`

`(x cos - sin x)/(x ^(2))`

`(sin x-x cos x)/(sin ^(2)x)`

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