中科新闻网钢珠多少会被判刑:有谁会计算这题?
来源：百度文库 编辑：中科新闻网 时间：2024/04/28 18:15:12
P(2cos@,2sin@)is a variable point on the curve x^2+y^2=4 . Q is the point (4,0),and N is the mid-point of PQ.
(i)to.prove that,for any value of a,P(2cos@,2sin@)is a point on the curve x^2+y^2=4.
(ii)Find the equation of the locus of N as P moves along the circle.
(iii)Sketch the locus of N.
(i)to.prove that,for any value of a,P(2cos@,2sin@)is a point on the curve x^2+y^2=4.
(ii)Find the equation of the locus of N as P moves along the circle.
(iii)Sketch the locus of N.
∵sina^2+cos^a=1
∴4sin^a+4cos^a=4
∴命题证明。
（2)
设N（x,y),Q(4,0)
则P(2x-4,2y)
然后代入圆的方程。算出x,y的关系式就可以了
（3）有可xy的关系式，就可以画了啊。顺便问一下，你高二了?
5.215142*X