STEP 2009: 23 of 26 questions decoded, by method & chapter.

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The paper at a glance, coloured by move. Click a square to open its question; empty squares are not decoded yet.

• 1Difference of Two SquaresKey methodPureCoordinate Geometry & Conics3 other sittings

  Same method, other sittings

  201220152018

  Worked solutionOpen the method
• 2Log-Derivative for Products & QuotientsKey methodPureFunctions & Curve Sketchingonly this sitting

  Same method, other sittings

  This one has only struck here so far.

  Worked solutionOpen the method
• 3Weierstrass SubstitutionKey methodPureTrigonometry2 other sittings

  Same method, other sittings

  20232024

  Worked solutionOpen the method
• 4Repeated Roots & the Remainder TheoremKey methodPureProof & Number Theory1 other sitting

  Same method, other sittings

  2016

  Worked solutionOpen the method
• 5Weierstrass & Structured SubstitutionsTunnelPureIntegration4 other sittings

  Same method, other sittings

  2008201420192020

  Worked solutionOpen the method
• 6Sandwiching Sums with IntegralsKey methodPureSequences & Series4 other sittings

  Same method, other sittings

  2012201420152017

  Worked solutionOpen the method
• 7Reverse-Engineering the AntiderivativeKey methodPureIntegration4 other sittings

  Same method, other sittings

  2011201620202021

  Worked solutionOpen the method
• 8Affine Combinations & the Section FormulaKey methodPureVectors & Matrices6 other sittings

  Same method, other sittings

  200620082012201420152024

  Worked solutionOpen the method
• 101D Collisions → Two ScalarsTunnelMechanics8 other sittings

  Same method, other sittings

  20062008201120132018201920222025

  Worked solutionOpen the method
• 11Variable AccelerationKey methodMechanics4 other sittings

  Same method, other sittings

  2008201220162017

  Worked solutionOpen the method
• 13Optimise Expected Cost or GainKey methodProb & StatsProbability & Statistics3 other sittings

  Same method, other sittings

  201520182022

  Worked solutionOpen the method

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The paper at a glance, coloured by move. Click a square to open its question; empty squares are not decoded yet.

• 1Sum & Product of ParametersKey methodPureCoordinate Geometry & Conics4 other sittings

  Same method, other sittings

  2016201720232024

  Worked solutionOpen the method
• 3Symmetry → Turning PointsAnchor Point & Derivative SignKey methodPureFunctions & Curve Sketching5 other sittings

  Same method, other sittings

  20112012201320152023

  Worked solutionOpen the method

  AlsoAnchor Point & Derivative Sign
• 4Reuse the Earlier ResultPavlovPureDifferential Equations5 other sittings

  Same method, other sittings

  20082013201620192020

  Worked solutionOpen the method
• 5Newton's Identities for Power SumsKey methodPureSequences & Series1 other sitting

  Same method, other sittings

  2014

  Worked solutionOpen the method
• 6Half-Angle FactorisationKey methodPureComplex Numbers3 other sittings

  Same method, other sittings

  201720182021

  Worked solutionOpen the method
• 7Leibniz → Maclaurin RecurrenceKey methodPureDifferential Equations1 other sitting

  Same method, other sittings

  2013

  Worked solutionOpen the method
• 8Reduction Formulae & TelescopingTerm-by-Term Series IntegrationKey methodPureIntegration8 other sittings

  Same method, other sittings

  20132015201620172018202020232024

  Worked solutionOpen the method

  AlsoTerm-by-Term Series Integration
• 9Projectiles → Split by AxisTunnelMechanics11 other sittings

  Same method, other sittings

  20062008201020122013201420172020202220232024

  Worked solutionOpen the method
• 10Spotting SHMKey methodMechanics4 other sittings

  Same method, other sittings

  2013201520162020

  Worked solutionOpen the method
• 11Variable AccelerationKey methodMechanics4 other sittings

  Same method, other sittings

  2008201220162017

  Worked solutionOpen the method
• 12Probability Generating FunctionsKey methodProb & StatsProbability & Statistics4 other sittings

  Same method, other sittings

  2008201120182025

  Worked solutionOpen the method
• 13CDF of a Transformed VariableTunnelProb & StatsProbability & Statistics8 other sittings

  Same method, other sittings

  20122014201520172019202020212022

  Worked solutionOpen the method