<p>求<img src="https://file.gaojiufeng.cn/learnAppQuestion/c9/a8/c9a879816b4d2dcb5f128a22f55790a6.jpg" style="width: 100%;height: auto;">其中D是由曲线<img src="https://file.gaojiufeng.cn/learnAppQuestion/92/9e/929ef1747eb98b8860829f0f19f9454b.jpg" style="width: 100%;height: auto;">与直线<img src="https://file.gaojiufeng.cn/learnAppQuestion/cf/cb/cfcb2f94e533b222af10a7299fcb4fa4.jpg" style="width: 100%;height: auto;">所围成的有界平面区域.</p>