问题描述:
1.若P0(xo,yo)在椭圆x^2/a^2+y^2/b^2=1外则过 p0做椭圆的两条切线,切点为p1,P2则求证切点弦p1,p2的直线方程是x0x/a^2+y0y/b^2=1;
2.若p0(x0,y0)在双曲线x^2/a^2-y^2/b^2=1(a大于0,b大于0)外,则过p0做双曲线的两条切线的切点为p1,p2则求证切点弦p1p2的直线方程是x0x/a^2-y0y/b^2=1
2.若p0(x0,y0)在双曲线x^2/a^2-y^2/b^2=1(a大于0,b大于0)外,则过p0做双曲线的两条切线的切点为p1,p2则求证切点弦p1p2的直线方程是x0x/a^2-y0y/b^2=1
问题解答:
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