Winston, a physics teacher, came into the classroom one morning. “Morning, my dears. I have a question for you today. Why do we have brakes (刹车) in our car?”
One student got up and replied, “Sir, to stop the car.”
Soon, all the students began to give similar answers. Being unhappy with them, the teacher decided to answer the question himself. He said, “I look at it in a
Hearing this, all the students in the classroom kept silent because no one had imagined this answer. The teacher continued, “Here’s one more truth.
All students were surprised at
The teacher smiled and continued, “Similarly, there are many such brakes in our life, such as the directions our parents need us to follow, the effort our teachers ask us to put in, or the progress we require ourselves to
Most of us have experienced one or two of those difficult situations and thought they were like brakes to stop our pace (脚步). But what if we
It is because of such difficult situations that we are able to reach where we are today. When we make good
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