The little ducklings and Mother Duck live in a beautiful pond in Xixi Wetland Park(西溪湿地公园). One day, they see some ducks flying. Listen! What are Little(L. D. ) and Mother Duck(M. D. ) talking?
L. D. : Mummy, look at those ducks. They can f
M. D. : Oh, baby. They are not ducks. They are wild g
L. D. : W
M. D. : They come from the n
L. D. : W
M. D. : It is winter now. So it is very c
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