(1)求该抛物线的表达式.
(2)正方形OPDE的顶点O为直角坐标系原点,顶点P在线段OC上,顶点E在y轴正半轴上,若△AOB与△DPC全等,求点P的坐标.
(3)在条件(2)下,点Q是线段CD上的动点(点Q不与点D重合),将△PQD沿PQ所在的直线翻折得到△PQD',连接CD',求线段CD'长度的最小值.
同类型试题
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x, x∈R, y∈[–1,1],周期为2π,函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x, x∈[–1,1], y∈[–π/2,π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2