A、<img src="http://img.wangxiao.cn/examfiles/imgcache/attached/image/20140605/20140605153749_4758.png" alt="" />
B、<img src="http://img.wangxiao.cn/examfiles/imgcache/attached/image/20140605/20140605153759_3985.png" alt="" />
C、sinx+x2+C
D、sinx+2x2+C