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tminhduc069
2 năm trước
CM: $\frac{1-sin²a.cos²a}{cos²a}$ - cos²a = tan²a *Đề có sai không ạ? em chứng minh $\frac{1+sin²a.cos²a}{cos²a}$ - cos²a = tan²a thì lại được :<
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