(2)如图2,若平分,直线交于点,请探究与之间的数量关系,并说明理由;
(3)如图3,在(2)问的条件下,连接并延长.若,,将绕着点以每秒的速度逆时针旋转,设旋转时间为秒,在旋转过程中,射线始终平分,是内部一条射线,平分,当,且的度数为射线与直线所夹锐角的倍时,直接写出的值(本题研究的所有角度均小于).
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