【基础巩固】
(1)参照小慧提供时思路,利用图(2)请证明上述结论;
(2)A、B、C、是同一直线l上从左到右顺次的点,点P是直线外一动点,平分;
【尝试应用】①若,,延长至D,使,若的长为定值,请求出这个值;
【拓展提高】②拓展:若,,,P点在l外运动时,使为定值,直接写出的长为 ___________(用含m、n的式子表示).
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