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tnthongnguyen27
2 năm trước
viết phương trình tiếp tuyến của đường tròn C:x^2+y^2+4x-8y+10=0 .Biết tiếp tuyến tạo với đường thẳng d:2x-3y+1=0 một góc bằng 60 độ.mn ới giúp mình
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