题目

Jenny seems __________ my family on Mid-autumn Day.      A. to visit          B. visit         C. visiting      D. visits 答案：A在△ABC中，角A，B，C所对的边分别为a，b，c，已知a=2，c=3，B=60°．（1）求b的值；（2）求sinA的值；（3）求sin（2A+C）的值．