<p>设z＝arctan<img src="https://learnfile.20230611.cn/learnAppQuestion/f6/a3/f6a3b7b96729241dbbcc7898642bcecd.jpg" style="width: 100%;height: auto;">，求<img src="https://learnfile.20230611.cn/learnAppQuestion/aa/0c/aa0ce4e7542e243a45f82afb27478776.jpg"