题目

   Can you resist cream cakes? I miss my sugar! I've decided to lose weight and I had to give up cakes. It's difficult because I have a sweet tooth and I love cream cakes. Not having treats can be good for your health. I've heard that the Burts，a family of five in South East England，lived sugar free for a whole year after they found out their daughter had diabetes (糖尿病).It wasn't easy. To avoid temptation，I don't go to any bakeries，but this family actually owns one，which makes up to 3，000 cakes a week. They were in shock when the doctor said that their 16-year-ol已知，且（1）用α+β，α-β表示2α；（2）求cos2α，sin2α，tan2α的值．