如图，正方形ABCD的边长为2，O为AD的中点，射线OP从OA出发，绕着点O顺时针方向旋转至OD，在旋转的过程中，记∠AOP为x（x∈0，π），OP所经过正方形ABCD内的区域（阴影部分）的面积S=f（x），那么对于函数f（x）有以下三个结论：

①f（$\frac{\mathrm{\pi }}{3}$）=$\frac{\sqrt{3}}{2}$；

②任意x∈0，$\frac{\mathrm{\pi }}{2}$，都有f（$\frac{\mathrm{\pi }}{2}$﹣x）+f（$\frac{\mathrm{\pi }}{2}$+x）=4；

③任意x₁，x₂∈（$\frac{\mathrm{\pi }}{2}$，π），且x₁≠x₂，都有$\frac{f\left(x_1\right)-f\left(x_2\right)}{x_1-x_2}$＜0．

其中所有正确结论的序号是____

阅读理解

How to Be a successful person

Gary Hall Jr

Winner of 5 Olympic Gold Medals

    “In 1997 I was found to have developed diabetes(糖尿病) . Believing my career was over, I felt extremely low. Then one of the specialists said there was no reason why I should stop training and competing. That was it—the encouragement I needed. I could still be a winner if I believe in myself. I am not saying that it isn't difficult sometimes. But I wanted to prove to myself that I wasn't finished yet. Nothing is to stand in my way.”

Karen Pickering

Swimming World Champion

     “I swim 4 hours a day, 6 days a week. I manage that sort of workload by putting it on top of my diary. This is the key to success—you can't follow a career in any field without being well-organized. List what you believe you can achieve. Trust yourself, write down your goals for the day, however small they are, and you'll be a step closer to achieving them.”

Kirsten Best

Poet & Writer

     “When things are getting hard, a voice inside my head tells me that I can't achieve something. Then, there are other distractions, such as family or hobbies. The key is to concentrate. When I feel tense, it helps a lot to repeat words such as ‘calm', ‘peace' or ‘focus', either out loud or silently in my mind. It makes me feel more in control and increases my confidence. This is a habit that can become second nature quite easily and is a powerful psychological tool.”

自然资源的分布一般都遵循明显的地域分异规律．（  ）