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2Â¥: Originally posted by alober at 2017-06-26 08:54:25
\angle ABP=x,BC=a \Rightarrow BQ:BC=\sin30^\circ:\sin(60^\circ+x),AB:BC=\cos(30^\circ+x) \Rightarrow \frac{\tan\angle AQP}{\tan\angle x} = \frac{\tan\angle AQP}{\tan\angle ABP} = \frac{AP:AQ}{AP:AB}  ...

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