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If a, b , c are the sides of a triangle and ka, kb, kc are the sides of a similar triangle inscribed in the former and F be the angle between the sides a and kc. prove 2kcos(F)=1

If a, b , c are the sides of a triangle and ka, kb, kc are the sides of a similar triangle inscribed in the former and F be the angle between the sides a and kc. prove 2kcos(F)=1

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