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127<br />

e a somma total dos elementos d'esté integral duplo é<br />

S = «j + «, ­f ... + ui + ... + um.<br />

Fazendo agora tender /i; e k para zero, e notando que x0<br />

e xn representam os dons valores de x tirados da equação<br />

F (x, y) = 0 correspondentes ao valor j/j de y, e que é<br />

lim \hRxv yi) + h f(xà, y>) + ... + /»> #)]<br />

/ii=oL<br />

J<br />

vem<br />

)dx,<br />

= . f(z, Vi<br />

J ? (í/0<br />

ff /" (x, y) (Jx dy = lim \k f /<strong>•</strong> (a>, fc) $<br />

J

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