讲台上有一盆引人夺目的紫藤花。花盆是用陶土做的,混身鸟黑发亮,底小口大,很像一个小巧玲珑的喇叭。盆口和盆低还镶着白色的边,显得很细致。花盆里这株紫藤花是用塑料做的!它的藤是黑褐色,弯弯曲曲,就像老人的龙头手杖。它有3米长的枝叶从杆上伸出来,睡到了地上,是那么美丽,那么柔美。
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