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[obm-l] Outra soma infinita



Outra soma infinita
 
1/2 + 1/3 + 1/5 + x/6 + 1/3x² + 2x²-1/5x³ +  x²/18 + 1/3x^4 +               4x^4-4x²+1/5x^6 + ... = 319/90
 
Se poderem responder para mim ficarei grato.