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Maths Edexcel Alevel Chapter 7 Trigonometry


for question 3b, I got 5/6pi as an x value. However the answer is -pi/6. Please can u explain why it is -pi/6 and not 5/6pi .

Many thanks in advance
(edited 4 weeks ago)
Reply 1
-pi/6 is wrong (easy to verify by subbing it in) and 5pi/6 is correct (same verification). Note it asks for ans to 2dp.
(edited 4 weeks ago)
Reply 2
ok, thank you

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