Ah, beta, for P3 I look first if the integral has a product of two different types—like a log or inverse function multiplied by something simple. If yes, by parts. Substitution I use when one part’s derivative is visibly sitting there, aau a quick clean replacement. In thirty seconds, my eyes scan for that relationship—it’s like checking if my spinach needs water or full sun. From fixing my neighbour’s thela-wala son’s maths copies, I’ve seen students overthink; the pattern shouts if you let it, bhala.
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