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1,Viết các tỉ số lượng giác sau thành tỉ số lượng giác của một góc nhỏ hơn 45° Sin70°,cos80°20 phút,tan72°13phút,cot49°37phút 2,tính A=cot89°×cot1°÷3phần 4 B=cos55°trên sin45°+1
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