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Investigation 7A: Is the Calculator Defective? & Investigation 7B: The Distance Formula and Compound Angle Identities

  • sin(a + b) = sina cosb + cosa sinb
  • sin(a - b) = sina cosb - cosa sinb
  • cos(a + b) = cosa cosb - sina sinb
  •  cos(a - b) = cosa cosb + sina sinb