So what integration technique should I use?
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**DI METHOD (for integration by parts)** [ Ссылка ]
start: 0:00
integral of ln(x)/x^3, 0:45
integral of sec^4(x), 2:29
integral of (2x+3)/(x^2-5x+4), 3:50
integral of x^2*tan(x^3), 5:50
integral of 1/(1+x^2)^(5/2), 7:17
integral of e^sqrt(x), 8:50
integral of sin^2(x), 10:37
integral of 1/(sqrt(x+1)-sqrt(x)), 11:20
integral of e^x/sec(x), 13:15
integral of 1/(1+cos(x)), 15:09
integral of (x-4)/(x^4-1), 17:44
integral of x^2/sqrt(1-x^2), 19:24

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