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Problem solving: vectors—three coordinates or one parameter?

Student Activity 𝅛 One Parameter 𝅛 Reflection in a Plane 𝅛 Exam-quality Working 𝅛 Follow-up ⭕ Learning Focus HL students only: reducing coordinate unknowns by parametrising a known line • recognising when an unknown point lies on a known line • replacing three coordinates with one parameter • using a plane normal as a perpendicular direction • identifying the foot of a perpendicular as a midpoint in a reflection •...

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