Please note that (c) is an extension problem, and comes under the bracket of Proof by Cases (a more generalised form of Proof by Exhaustion that links in with Direct Proof).
This video is designed for the new specification for A-Level Maths, first teaching in September 2017.
Please note that for those who are studying just AS Maths, only those videos that have their title in [...] brackets are applicable.
Tagged under: A-Level Maths,Proof,Proof Exhaustion
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