从圆X^2-2X+Y^2-2Y+1外一点P(3.2)向这个圆作两条切线.这两切线夹角的余弦值为多少?
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![从圆X^2-2X+Y^2-2Y+1外一点P(3.2)向这个圆作两条切线.这两切线夹角的余弦值为多少?](/uploads/image/z/5599468-28-8.jpg?t=%E4%BB%8E%E5%9C%86X%5E2-2X%2BY%5E2-2Y%2B1%E5%A4%96%E4%B8%80%E7%82%B9P%EF%BC%883.2%EF%BC%89%E5%90%91%E8%BF%99%E4%B8%AA%E5%9C%86%E4%BD%9C%E4%B8%A4%E6%9D%A1%E5%88%87%E7%BA%BF.%E8%BF%99%E4%B8%A4%E5%88%87%E7%BA%BF%E5%A4%B9%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC%E4%B8%BA%E5%A4%9A%E5%B0%91%3F)
从圆X^2-2X+Y^2-2Y+1外一点P(3.2)向这个圆作两条切线.这两切线夹角的余弦值为多少?
从圆X^2-2X+Y^2-2Y+1外一点P(3.2)向这个圆作两条切线.这两切线夹角的余弦值为多少?
从圆X^2-2X+Y^2-2Y+1外一点P(3.2)向这个圆作两条切线.这两切线夹角的余弦值为多少?
先把圆配方,(x-1)^2+(y-1)^2=1.那么其中一条切线过点M(1,2).这个太明显了,连求都不用求.设圆心为O,由切线性质可知,PM=2,OM=1,OP=根号5,所以cosOPM=PM/OP=2/根号5,由倍角公式可知,两切线夹角余弦=2*cos^2OPM-1=3/5
从圆x^2+y^2-2x-2y+1=0外一点P(2,3),引圆的切线,求切线方程
从圆x^2+y^2-2x-2y+1=0外一点(3,2)向这个圆做两条切线,则两切线夹角的余弦值
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