- #1

- 62

- 0

(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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- #1

- 62

- 0

(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 !

- #2

Science Advisor

Homework Helper

- 26,259

- 622

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.

- #3

- 62

- 0

hello Dick !

first of all tnx.

i can't use l'Hopital's theorem cause n =1,2,3...

so F(n) not differentiable .

- #4

Science Advisor

Homework Helper

- 26,259

- 622

f(x)=ln(cos(a/x))*x^3 is differentiable. If you know the limit of f(x) as x->infinity, then you know the limit of L as n->infinity.

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