Trig Question 8(c) Solution Discussion - Edexcel 6665-01 January 2011 Exam

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The discussion centers on the solution to question 8(c) from the Edexcel 6665-01 January 2011 exam, specifically regarding the omission of a plus-minus sign in the mark scheme. Participants debate whether the absence of this sign is justified, considering that the inverse function typically refers to the principal value branch, which is conventionally taken to have a positive slope. Some argue that the mark scheme should include the plus-minus sign to accurately reflect the solution. The conversation highlights the nuances of interpreting inverse functions in trigonometry. Ultimately, clarity in the mark scheme is deemed important for accurate student assessment.
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I would have put a ##\pm## sign on it. But one might also make the argument that the inverse function is understood to mean the principal value branch. In that case the principal value branch is usually chosen to have positive slope. Your mileage may vary.
 

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