AQA Core 2 C2 June 2015 Q6 Trigonometric equations

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AQA Core 2 C2 June 2015 Q6 Trigonometric equations
Exam question on solving trigonometric equations
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Thank you so much! This was very helpful

barnatiwari
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for the last part of the question, when you used divided by cos theta to get tan theta, why did you choose cos theta=-1/3 and not cos theta=1/2?

shabzieluqman