P 2 Chapter 8 Parametric Equations jfrosttiffin kingston
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P 2 Chapter 8 : : Parametric Equations jfrost@tiffin. kingston. sch. uk www. drfrostmaths. com @Dr. Frost. Maths Last modified: 6 th September 2018
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Chapter Overview 1: : Converting from parametric to Cartesian form. 2: : Sketching parametric curves. 3: : Finding points of intersection. 4: : Modelling Teacher Note: There is no change in this chapter relative to the old pre-2017 syllabus.
What are they and what is the point?
Converting parametric to Cartesian How could we convert these parametric equations into a single Cartesian one? ? What is the domain of the function? ? ?
Further Example ? a ? b
Test Your Understanding Edexcel C 4 Jan 2008 Q 7 ? Edexcel C 4 Jan 2011 ?
Exercise 8 A Pearson Pure Mathematics Year 2/AS Pages 200 -202
…when you have trig identities a ? ? b ?
Test Your Understanding C 4 June 2013 which double angle formula would be best here? ? ? a ? b
Exercise 8 B Pearson Pure Mathematics Year 2/AS Pages 204 -206 Further Exam Practice C 4 June 2012 Q 6 ?
Sketching Parametric Curves We saw that one strategy for sketching parametric curves is to convert into a Cartesian equation, and hope this is a form we recognise (e. g. quadratic or equation of circle) to appropriately sketch. However, some parametric equations can’t easily be turned into Cartesian form:
Sketching Parametric Curves ? ? ?
Test Your Understanding 25 20 ? 15 10 5 -2 2 4 6 8 10
Exercise 8 C Pearson Pure Mathematics Year 2/AS Pages 207 -208 (This exercise could probably be skipped for classes in a rush)
Points of Intersection a b ? ?
Points of Intersection Whenever you want to solve a Cartesian equation and pair of parametric equations simultaneously, substitute the parametric equations into the Cartesian one. b a ? ?
Test Your Understanding C 4 Jan 2013 a ? b ?
Exercise 8 D Pearson Pure Mathematics Year 2/AS Pages 211 -213
Modelling DF M a b c d ? ? e Plane would continue to climb forever! ?
Further Example a ? c b ? ? d ?
Exercise 8 E Pearson Pure Mathematics Year 2/AS Pages 218 -220
Just For Fun… (Yes, I realise this is a Cartesian equation, not parametric ones – but it looked pretty!)
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