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Mathematics, 24.07.2021 17:10 maltbie1283

cho tam giác ABC vuông tại A < góc B=a chứng minh: a) 1+tan^{2}a=\frac{1}{sin^{2}a }

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cho tam giác ABC vuông tại A < góc B=a chứng minh: a) 1+a=...
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