计算下列定积分：<br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/068aeae0ab988cf86a6d81f955ed3290.jpg"/><br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/23eb6faed923fe0db01b1514fe0d292c.jpg"/><br/> B、<img src="https://static.zxtiku.com/wangke/imgs/topic/5add4d1782f2c8cca9aef83073a023f4.jpg"/><br/> C、<img src="https://static.zxtiku.com/wangke/imgs/topic/9c6867613d1e78c3de5c080a4824e5b5.jpg"/><br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/5891e9e02b9d8cfc32d5dc1f4736c04d.jpg"/>