春天最美的是lí明,天空染上微微的红yùn。夏天qī黑的暗夜,美在有无数的萤火虫翩翩飞舞。秋天的黄昏,夜mù降临,风声、虫鸣听起来yù发叫人心kuàng神yí。冬天最美是早晨,手捧暖和的火盆穿过走廊时,那闲 yì的心情和寒冷的冬晨多么和谐啊!只是等中午火炭变成白灰,未miǎn令人有点儿扫兴。
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