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How to derive formulae for trigonometric functions
  • How to naturally memorise trigonometric identities
  • Definition of trigonometric functions
  • Addition formulae
  • Classification based on the definition and the addition formulae
  • Derivation of formulae using the definition
  • Derivation of formulae using the addition formulae
  • 三角関数の公式を自然に覚える方法
  • 三角関数の定義と加法定理に基づく公式の分類
  • 三角関数の定義や加法定理を使った公式の導出