STEP 2017: 24 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.

• 1Reduction Formulae & TelescopingIntegral → Linear SystemKey methodPureIntegration6 other sittings

  Same method, other sittings

  200920132015201620202023

  Worked solutionOpen the method

  AlsoIntegral → Linear System
• 2Constant & Periodic SequencesKey methodPureSequences & Series3 other sittings

  Same method, other sittings

  200620082019

  Worked solutionOpen the method
• 3General Solutions of Trig EquationsPavlovPureTrigonometry3 other sittings

  Same method, other sittings

  200820112023

  Worked solutionOpen the method
• 4Square-a-Bracket InequalitiesKey methodPureIntegration2 other sittings

  Same method, other sittings

  20142023

  Worked solutionOpen the method
• 5Parametrising ConicsNormals → Cubic RootsKey methodPureCoordinate Geometry & Conics6 other sittings

  Same method, other sittings

  200620082014201620182022

  Worked solutionOpen the method

  AlsoNormals → Cubic Roots
• 6Sandwiching Sums with IntegralsKey methodPureSequences & Series4 other sittings

  Same method, other sittings

  2009201220142015

  Worked solutionOpen the method
• 7Stationary Points by FactoringDerivative Sign → InequalitiesKey methodPureDifferentiation3 other sittings

  Same method, other sittings

  201820222024

  Worked solutionOpen the method

  AlsoDerivative Sign → Inequalities
• 8Perpendicularity → Dot Product ZeroMatching Coefficients to Intersect LinesKey methodPureVectors & Matrices5 other sittings

  Same method, other sittings

  20062008201120192020

  Worked solutionOpen the method

  AlsoMatching Coefficients to Intersect Lines
• 9Limiting EquilibriumTunnelMechanics10 other sittings

  Same method, other sittings

  2006201220132014201820192020202220232024

  Worked solutionOpen the method
• 10Variable AccelerationKey methodMechanics4 other sittings

  Same method, other sittings

  2008200920122016

  Worked solutionOpen the method
• 11Projectiles → Split by AxisTunnelMechanics11 other sittings

  Same method, other sittings

  20062008200920102012201320142020202220232024

  Worked solutionOpen the method
• 12Exponential MemorylessnessKey methodProb & StatsProbability & Statisticsonly this sitting

  Same method, other sittings

  This one has only struck here so far.

  Worked solutionOpen the method
• 13Compare Strategies by FactoringKey methodProb & StatsProbability & Statistics2 other sittings

  Same method, other sittings

  20082010

  Worked solutionOpen the method

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• 3
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• 11
• 12
• 13

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

• 1Sum → Telescoping DifferenceKey methodPureCombinatorics & Binomial1 other sitting

  Same method, other sittings

  2008

  Worked solutionOpen the method
• 2Rotation as MultiplicationHalf-Angle FactorisationKey methodPureComplex Numbers7 other sittings

  Same method, other sittings

  2006200820092014201820202021

  Worked solutionOpen the method

  AlsoHalf-Angle Factorisation
• 3Symmetric Functions & Power SumsQuartic → Two QuadraticsKey methodPureAlgebra & Inequalities2 other sittings

  Same method, other sittings

  20082010

  Worked solutionOpen the method

  AlsoQuartic → Two Quadratics
• 5Polar Gradient & Cutting AngleKey methodPureCoordinate Geometry & Conics2 other sittings

  Same method, other sittings

  20062021

  Worked solutionOpen the method
• 6Reciprocal Substitution FoldingKey methodPureIntegration6 other sittings

  Same method, other sittings

  201220142015201820232025

  Worked solutionOpen the method
• 7Parametrising ConicsSum & Product of ParametersQuadratic → DiscriminantKey methodPureCoordinate Geometry & Conics11 other sittings

  Same method, other sittings

  20062008200920142015201620182022202320242025

  Worked solutionOpen the method

  AlsoSum & Product of ParametersQuadratic → Discriminant
• 8Telescoping SumsKey methodPureSequences & Series6 other sittings

  Same method, other sittings

  201220142015201620222024

  Worked solutionOpen the method
• 9Centre-of-Mass FrameKey methodMechanics2 other sittings

  Same method, other sittings

  20112016

  Worked solutionOpen the method
• 11Repeated Impacts → RecurrenceKey methodMechanics3 other sittings

  Same method, other sittings

  201020122018

  Worked solutionOpen the method
• 12Variance via CovariancesKey methodProb & StatsProbability & Statistics3 other sittings

  Same method, other sittings

  200620132016

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

  Same method, other sittings

  20092012201420152019202020212022

  Worked solutionOpen the method