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141<br />

II<br />

Applicnção A tlicorin. do numcroit<br />

SO. — irracionalidade do numero T.. — Da consideração<br />

do integral<br />

u = f (I — x*)" cos jxdx<br />

lirou o sr. Ilcrmile uma demonstração muito elegante da irracionalidade<br />

do numero it (*).<br />

Sendo n um numero par e (1 — x*f — / (*). lcmos<br />

(n.°3 — II)<br />

f l f(x) cos Ï­ xdx ­ 1 ^ / (*) sen | xj^<br />

­ ff 1 f («) sen |

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