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Integration by parts — the formula is: ∫u dv = uv - ∫v du The trick is choosing u and dv. Use LIATE to decide: L — Logarithms I — Inverse trig A — Algebraic (polynomials) T — Trig E — Exponentials Pick u from whichever comes FIRST in LIATE. Example: ∫x·eˣ dx → x is Algebraic, eˣ is Exponential → pick u = x → u = x, dv = eˣ dx → du = dx, v = eˣ → = xeˣ - ∫eˣ dx = xeˣ - eˣ + C ✅ Want to try one together?