已知圆O:X2+Y2=1和定点A (2,1),由圆O外一点P(a,b)像圆O引切线PQ,切点为Q,且满足绝已知圆O:X2+Y2=1和定点A (2,1),由圆O外一点P(a,b)像圆O引切线PQ,切点为Q,且满足绝对值的PQ=绝对值的PA(1)求证:动
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![已知圆O:X2+Y2=1和定点A (2,1),由圆O外一点P(a,b)像圆O引切线PQ,切点为Q,且满足绝已知圆O:X2+Y2=1和定点A (2,1),由圆O外一点P(a,b)像圆O引切线PQ,切点为Q,且满足绝对值的PQ=绝对值的PA(1)求证:动](/uploads/image/z/5499878-14-8.jpg?t=%E5%B7%B2%E7%9F%A5%E5%9C%86O%3AX2%2BY2%3D1%E5%92%8C%E5%AE%9A%E7%82%B9A+%282%2C1%29%2C%E7%94%B1%E5%9C%86O%E5%A4%96%E4%B8%80%E7%82%B9P%28a%2Cb%29%E5%83%8F%E5%9C%86O%E5%BC%95%E5%88%87%E7%BA%BFPQ%2C%E5%88%87%E7%82%B9%E4%B8%BAQ%2C%E4%B8%94%E6%BB%A1%E8%B6%B3%E7%BB%9D%E5%B7%B2%E7%9F%A5%E5%9C%86O%EF%BC%9AX2%2BY2%3D1%E5%92%8C%E5%AE%9A%E7%82%B9A+%282%2C1%29%2C%E7%94%B1%E5%9C%86O%E5%A4%96%E4%B8%80%E7%82%B9P%EF%BC%88a%2Cb%EF%BC%89%E5%83%8F%E5%9C%86O%E5%BC%95%E5%88%87%E7%BA%BFPQ%2C%E5%88%87%E7%82%B9%E4%B8%BAQ%2C%E4%B8%94%E6%BB%A1%E8%B6%B3%E7%BB%9D%E5%AF%B9%E5%80%BC%E7%9A%84PQ%3D%E7%BB%9D%E5%AF%B9%E5%80%BC%E7%9A%84PA%EF%BC%881%EF%BC%89%E6%B1%82%E8%AF%81%EF%BC%9A%E5%8A%A8)
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