Hãy biến đổi các tỉ số lượng giác sau về các tỉ số lượng giác nhỏ hơn 45 độ a) Sin 56 độ ; Cos 68 độ ; Tan 79 độ ; Cot 89 độ b) Sin 56 độ 12' ; Cos 64 độ 7' ; Tan 72 độ 36' ; Cot 81 độ 54'

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