已知、满足,且
(1)请填空:______,______,______
(2)若红外线先转动20秒,红外线才开始转动,在红外线第一次旋转到之前,红外线转动多少秒,两条红外线互相平行?
(3)如图2,若检修时关闭红外线探测仪,红外线交直线于点,射线平分,过点作,垂足为点,作的角平分线交于点,当红外线从第一次旋转到的过程中,求与的数量关系.
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