已知函数<img src="https://static.pphuashu.com/wangke/imgs/topic/f32ba5e998c3f4b1c5a203a6b5eb6865.png.png"/> 具有任意阶导数,且<img src="https://static.zxtiku.com/wangke/imgs/topic/eb8f73b89261b7898cc97dbcf0d8fa58.png"/> ,则当<img src="https://static.zxtiku.com/wangke/imgs/topic/e238e6e1c1cd4b2781ca0a582b271e0b.png"/> 时,<img src="https://static.zxtiku.com/wangke/imgs/topic/c0c011c9c08bb3254b87b1802bb03672.png"/> 为( ).