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Formula Sheets / Maths

Chapter 20

Definite Integration

Revise with flashcards Download this chapter (PDF) All Maths formulas (PDF)
PropertiesNewton–Leibniz ruleLimit as a sumStandard results

Properties

  • ∫ab​f(x)dx=∫ab​f(a+b−x)dx,∫0a​f(x)dx=∫0a​f(a−x)dx
  • ∫−aa​f(x)dx={2∫0a​f(x)dx,0,​f evenf odd​
  • ∫02a​f(x)dx={2∫0a​f(x)dx,0,​f(2a−x)=f(x)f(2a−x)=−f(x)​
  • Periodic

    ∫0nT​f(x)dx=n∫0T​f(x)dx
  • King's rule example

    ∫0π/2​sinnx+cosnxsinnx​dx=4π​

Newton–Leibniz rule

  • dxd​∫g(x)h(x)​f(t)dt=f(h(x))h′(x)−f(g(x))g′(x)

Limit as a sum

  • n→∞lim​n1​r=1∑n​f(nr​)=∫01​f(x)dx

Standard results

  • Wallis

    ∫0π/2​sinnxdx=nn−1​⋅n−2n−3​⋯×{2π​,1,​n evenn odd​
  • ∫0π/2​lnsinxdx=−2π​ln2
  • Special functions

    ∫ab​[x]dx: split at integers;∫∣f(x)∣dx: split where f=0
Indefinite IntegrationArea Under Curves