(1)如图1,若,,求线段的长;
(2)如图2,以为边在上方作等边,点是的中点,连接并延长,交的延长线于点. 若,求证:;
(3)在取得最小值的条件下,以为边在右侧作等边.点为所在直线上一点,将沿所在直线翻折至所在平面内得到. 连接,点为的中点,连接,当取最大值时,连接,将沿所在直线翻折至所在平面内得到,请直接写出此时的值.
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