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Ben is a 13-year old American boy. Today is his birthday. His family come together to celebrate his birthday. Uncle David is a very tall man, but his wife is very short, they love each other very much .They bring a plane model to Ben. Ben’s mom send a book to him, and his dad promised to take him to see the NBA.Ben had a very meaningful birthday this year.
1.Yes or No.
1) Ben lives in London. ( )
2) Ben loves dancing in his spare time. ( )
3) Uncle David is a little fat but very young. ( )
2.Answer the questions.
1) How many people come to Ben’s birthday?
___________________________________ .
2) Is Ben happy today?
___________________________________ .
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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
