(1)请写出a和b的数量关系;
(2)如图2,点D为的中点,点P为y轴负半轴上一点,以为边作等边三角形,连接并延长交x轴于点M,若,求点M的坐标;
(3)如图3,点C与点A关于y轴对称,点E为的中点,连接,过点B作,且,连接交于点P,过点F作轴交的延长线于点M,
①求证:P为的中点;
②求的值.
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