Help me các chuyên gia toán ơi giúp mình bài này ạ các chuyên gia toán . Còn các bạn mà bạn nào biết làm hết thì làm nhé chứ đừng spam ạ bài này khó nên các bạn pk biết làm thì giúp nhé ạ còn để chuyên gia giúp ạ !! Cho tam giác ABC nội tiếp đường tròn (O) . Các tia phân giác của góc B và góc C cắt nhau tại I và cắt đường tròn (O) lần lượt tại D và E . Dây DE cắt các cạnh AB và AC lần lượt tại M và N . Chứng minh rằng a) Tam giác AMN là tam giác cân b) Các tam giác EAI và DAI là những tam giác cân c) Tứ giác AMIN là hình thoi

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