I=∫0∞1( 1 +X2)registro( 1 + x )−−−−−−−−√dX
Mi intento:
Sustituyendox = bronceadoθ
I=∫0π21registro( 1 + bronceadoθ )−−−−−−−−−−−√dθ
Al aplicar∫abF( x ) rex =∫abF( un + segundo - X ) reX
I=∫0π21registro( 1 + cunaθ )−−−−−−−−−−−√dθ
Sumando ambos y simplificando,
2 yo=∫0π2registro( 1 + cunaθ )−−−−−−−−−−−√+registro( 1 + bronceadoθ )−−−−−−−−−−−√registro( 1 + cunaθ ) registro( 1 + bronceadoθ )−−−−−−−−−−−−−−−−−−−−−√dθ
Racionalizando el numerador,
2 yo=∫0π2registro( 1 + cunaθ ) − logaritmo( 1 + bronceadoθ )registro( 1 + cunaθ ) registro( 1 + bronceadoθ )−−−−−−−−−−−−−−−−−−−−−√(registro( 1 + cunaθ )−−−−−−−−−−−√−registro( 1 + bronceadoθ )−−−−−−−−−−−√)dθ
∴2 yo=∫0π2registro( 1 + bronceadoθ ) − logaritmo( 1 + bronceadoθ ) − logaritmobroncearseθregistro( 1 + cunaθ ) registro( 1 + bronceadoθ )−−−−−−−−−−−−−−−−−−−−−√(registro( 1 + cunaθ )−−−−−−−−−−−√−registro( 1 + bronceadoθ )−−−−−−−−−−−√)dθ
∴2 yo=∫0π2− registrobroncearseθregistro( 1 + cunaθ ) registro( 1 + bronceadoθ )−−−−−−−−−−−−−−−−−−−−−√(registro( 1 + cunaθ )−−−−−−−−−−−√−registro( 1 + bronceadoθ )−−−−−−−−−−−√)dθ
Nuevamente aplicando la propiedad∫abF( x ) rex =∫abF( un + segundo - X ) reX
∴2 yo=∫0π2− registrocunaθregistro( 1 + bronceadoθ ) registro( 1 + cunaθ )−−−−−−−−−−−−−−−−−−−−−√(registro( 1 + bronceadoθ )−−−−−−−−−−−√−registro( 1 + cunaθ )−−−−−−−−−−−√)dθ
Sumando ambas ecuaciones,
2 yo=∫0π2− registrobroncearseθ + registrobroncearseθregistro( 1 + bronceadoθ ) registro( 1 + cunaθ )−−−−−−−−−−−−−−−−−−−−−√(registro( 1 + bronceadoθ )−−−−−−−−−−−√−registro( 1 + cunaθ )−−−−−−−−−−−√)dθ
∴4 yo= 0
∴I= 0
Pero DESMOS me da la respuesta acercándose2.53824756838
¿Qué tiene de malo mi enfoque?
N74
Lee David Chung Lin
yuriy s