Triplication #2

Geometry Level 4

Let A B C ABC be a non-obtuse triangle such that A B \overline{AB} > > A C \overline{AC} and B ^ \widehat{B} = = 4 5 45^{\circ} . Let O O and I I denote the circumcenter and incenter of triangle A B C ABC , respectively. Suppose that 2 O I = A B A C \sqrt{2}\cdot \overline{OI}= \overline{AB}-\overline{AC} . If the product of all the possible values of sin A \sin{A} can be written as 1 F 1 G , \sqrt{\frac{1}{\sqrt{F}}-\frac{1}{G}}, where F , G F,G are all integers. Find G F \large \frac{G}{F} .


The answer is 2.

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