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íol<br />

e que, por ser/ dx finito e determinado quando n<br />

varia desde 0 até , existem dons numéros m e M entre os<br />

quaes este integral está comprehendido. Logo temos (n.° 21<br />

— 3.°)<br />

d'onde se tira<br />

J o<br />

1<br />

r /*./« / \ sen nx ,<br />

lim / yn

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