Mathematics, 10.09.2021 04:30 noahgampp

Cho tam giác ABC cân tại A, góc A=36 độ, BC=1 cm, phân giác CD. Hãy tính cos góc A ( Mình đang cần gấp ạ, bạn nào giải giúp mình xin cảm ơn ạ! )

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Cho tam giác ABC cân tại A, góc A=36 độ, BC=1 cm, phân giác CD. Hãy tính cos góc A ( Mình đang cần...