(2)当点恰好落在抛物线上,且点不与点重合时,求线段的长;
(3)连结、、,当是钝角三角形时,求的取值范围;
(4)当时,连结并延长交抛物线的对称轴于点,过点作直线的垂线,垂足为点,连结、、,当折线与抛物线有两个交点(不包括点)时,设这两个交点分别为点、点,当四边形(或四边形)的面积是四边形的面积的一半时,直接写出所有满足条件的的值.
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