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f'(0) = lim(n->oo) nf(1/n) and f(0)=0 U...

`f'(0) = lim_(n->oo) nf(1/n) and f(0)=0` Using this, find `lim_(n->oo)((n+1)(2/pi)cos^(- 1)(1/n)-n)),|cos^(-1)1/n|

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