2010 HSC Q (1 Viewer)

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For this question. I don't understand how they used (ii) to solve. Is there a certain property they used?? How do we do this question
 

HSCya1234567

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Ah so I was stuck on this question, basically the formatting is weird, they want aii, which is the tan(A-B) = pi/2 thing from before, and then you use that to simplify the tan2thetatana
 

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