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如何证明：过双曲线上一点a作切线，交渐�线于a、b，则ab=ac 知乎 Template






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sketch 4176 Eye by Jawad Kallou
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sketch 5150 Regina from Dino Crisis by Hsien-Ying Hsieh
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sketch 3727 Stitch by Louis Tradieu
sketch 2668 Butterfly by Loai Issa
sketch 5308 Taylor Swift by Gabi Ferrari
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