题目1单选题
求函数<img src="https://tihai-oss-cloud.itihey.com/img/4341e7b6e1bf31ecea2814116ab778b1.png">的导函数A. <img src="https://tihai-oss-cloud.itihey.com/img/ebe161cfb38144ac81ac78c2d7c4c314.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/1d36010e6bdf695c35f812f2f166aba1.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/bdf4be86e4515cbc56e9593498072eff.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/170f0e8b1ab8534318cdaa472eafd49a.png">