N -lim n-cos -4n -sin -4n is equal to

X →∞lim n.cos ( π/4n ) sin (π/4n ) = n →∞limn/2 sinπ/2n =π/4 ...

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Standard Limits to Remove Indeterminate Form

n →∞lim n.cos...

Question

$lim n \to \infty n . cos (\frac{π}{4 n}) . sin (\frac{π}{4 n})$ is equal to

\frac{π}{4}

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\frac{π}{6}

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\frac{π}{9}

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\frac{π}{3}

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