the problem solve it
题目
the problem solve it
The tangent line to a circle may be defined as the line that intersects the circle in a single point,called the point of tangency.If the equation if the circle is
x^2 + y^2 = r^2 and the equation of the tangent line is y = mx + b,
a) show that r^2(1 + m^2) = b^2
b) the point of tangency is (-r^2m/b,r^2/b)
c) the tangent line is perpendicular to the line containing the center of the circle and the point of tangency.
HINT:The quadratic equation x^2 + (mx + b) ^2 = r^2 has exactly one solution.
答案
举一反三
已知函数f(x)=x,g(x)=alnx,a∈R.若曲线y=f(x)与曲线y=g(x)相交,且在交点处有相同的切线,求a的值和该切线方程.
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
最新试题
热门考点
- 9分之7就是把( )平均分成( )份,表示其中( )分的数,它是一个( )分数
- 地震给大自然能带来什么好处
- 计算题.1、 0.3m^2n-5分之1mn^2+0.4n^2m-m^2n-2分之1nm^2
- 甲,乙两数的和是306,甲数是乙数的2倍,甲数是()乙数是()
- 以中国梦,我的梦为主题写一篇书信格式的作文.要书信格式的,梦想是当医生.下午就要写了.
- 高一必修二运动的合成与分解的一些问题,谢o(∩_∩)o
- 1/3+1/15+1/35+……1/399+1/483=
- 探究四驱车的物理原理写探究报告
- the house is made of wood and straw,and() to collapse in a heavy storm a.liable b,easy
- 220V串联一个0.15兆欧的四环电阻还能再串一个多少V的电源指示灯