题目

You may have seen foreigners climb the Great Wall,but have you ever seen foreigners pick up garbage in the Great Wall? And he has done this thing for more than 20 years! He’s an Englishman, William Lindesay. Since 1998,William has organized volunteers from all over the world to pick up garbage from the Great Wall every year.Today,William has been in China for more than 30 years,during which he founded an organization to pick up garbage.He wanted to make people pay more attention to the environment of the Great Wall.Why does William love the Great Wall so much?When William was a student, he s已知函数y=sinx2+3cosx2，x∈R．（1）求y取最大值时相应的x的集合；（2）该函数的图象经过怎样的平移和伸变换可以得到y=sinx（x∈R）的图象．