题目

以“My Day”为题，写一篇小短文。写作要求：1）书写认真工整，语句通顺合理；2）不少于五句话。 答案：My Day Yesterday was Sunday. I got up at six o'clock. In the morning I helped my mother clean the house. After that I helped my father wash the car. I had lunch at twelve o'clock. I went to the library with my mother after lunch. I read lots of interesting books. I do my homework in the evening. I was really busy, but I was very happy.已知函数f（x）=a+bsinx+ccosx（其中b＞0）的图象经过点A（0，1）、B（π2，1）．当x∈[0，π2]时，f（x）的最大值为22-1．（Ⅰ）求f（x）的解析式；（Ⅱ）由y=sinx的图象经过怎样的变换可得到f（x）的图象．