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[tex]

\mathop {\lim }\limits_{n \to \infty } 2\pi r + 2nR\sin \frac{\pi }{n}

[/tex]

For a limit like that, can i just substitute infinity into the equation? Or is there some rule against that? If so, would i be right in saying:

[tex]

\mathop {\lim }\limits_{n \to \infty } 2\pi r + 2nR\sin \frac{\pi }{n} = 2\pi r

[/tex]

Thanks for the help.

Dan.