Same as P2 avanzados\nlet $ ABC $ an equilateral triangle with circum circle $ w $ let $ P $ a point on arc $ BC $ ( point $ A $ is on the other side ) pass a tangent line $ d $ through point $ P $ such that $ P \cap AB = F $ and $ AC \cap d = L $ let $ O $ the center of the circle $ w $ prove that $ \angle LOF > 90^{0} $