# Calculate the limit of the series

need to calculate the limit of the series

(cos(a/n))^(n^3) n goes to infinity and a=!0

i try that :

e^L

L= the limit of (n^3)*ln(cos(a/n))

what now ???

TNX !

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Dick
Homework Helper

L has the form 0*infinity. Use l'Hopital's theorem on it to try and figure out the limit. You may have to use l'Hopital more than once.

L has the form 0*infinity. Use l'Hopital's theorem on it to try and figure out the limit. You may have to use l'Hopital more than once.
hello Dick !

first of all tnx.

i cant use l'Hopital's theorem cause n =1,2,3.....

so F(n) not differentiable .

Dick