数学问题:由动点P向圆x^2+y^2=1引两条切线PA,PB1,由动点P向圆x^2+y^2=1引两条切线PA,PB,切点分别为A,B,∠APB=60度,则动点P的轨迹方程为________2,设P(x,y)是圆x^2+(y-1)^2=1上的动点,若不等式x+y+c>0恒成立,则c
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![数学问题:由动点P向圆x^2+y^2=1引两条切线PA,PB1,由动点P向圆x^2+y^2=1引两条切线PA,PB,切点分别为A,B,∠APB=60度,则动点P的轨迹方程为________2,设P(x,y)是圆x^2+(y-1)^2=1上的动点,若不等式x+y+c>0恒成立,则c](/uploads/image/z/5462977-49-7.jpg?t=%E6%95%B0%E5%AD%A6%E9%97%AE%E9%A2%98%3A%E7%94%B1%E5%8A%A8%E7%82%B9P%E5%90%91%E5%9C%86x%5E2%2By%5E2%3D1%E5%BC%95%E4%B8%A4%E6%9D%A1%E5%88%87%E7%BA%BFPA%2CPB1%2C%E7%94%B1%E5%8A%A8%E7%82%B9P%E5%90%91%E5%9C%86x%5E2%2By%5E2%3D1%E5%BC%95%E4%B8%A4%E6%9D%A1%E5%88%87%E7%BA%BFPA%2CPB%2C%E5%88%87%E7%82%B9%E5%88%86%E5%88%AB%E4%B8%BAA%2CB%2C%E2%88%A0APB%3D60%E5%BA%A6%2C%E5%88%99%E5%8A%A8%E7%82%B9P%E7%9A%84%E8%BD%A8%E8%BF%B9%E6%96%B9%E7%A8%8B%E4%B8%BA________2%2C%E8%AE%BEP%28x%2Cy%29%E6%98%AF%E5%9C%86x%5E2%2B%28y-1%29%5E2%3D1%E4%B8%8A%E7%9A%84%E5%8A%A8%E7%82%B9%2C%E8%8B%A5%E4%B8%8D%E7%AD%89%E5%BC%8Fx%2By%2Bc%3E0%E6%81%92%E6%88%90%E7%AB%8B%2C%E5%88%99c)
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