求x=1+cos(t)和y=sin(t) 面积
问题描述：
求x=1+cos(t)和y=sin(t) 面积
题目是英文的:
find the area of the region bounded by x=1+cos(t),y=sin(t) and the x-axis for 0小于等于t小于等于pi/2
非常感激啊..
答
(x-1)^2+y^2=1
所以面积为π/4