So what integration technique should I use? When to use trig sub? When do you use integration by parts? This calculus tutorial will strengthen your integration skills! Q1 to Q5 Solution: 👉 Full solution (plus problem and solution files) 👉 **DI METHOD (for integration by parts)** 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 #calculus #blackpenredpen #apcalculusbc