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Cofunction and symmetry identities

  • sin(90∘−θ)=cosθ
  • cos(90∘−θ)=sinθ
  • tan(90∘−θ)=cotθ
  • sin(−θ)=−sinθ
  • cos(−θ)=cosθ
  • sin(180∘−θ)=sinθ

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