８〜１０行目について、何故９行目の式が成り立つときθに対してｘが単調減少するのですか？
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![(2)[1]の式はなぜこうなるのでしょうか？
解説お願いします🙏🏻 - 1](https://d1e9oo257tadp1.cloudfront.net/uploads/qa_question_image/file/1810073/thumb_l_webp_1717B3E3-8A84-49A5-82D1-466207496D96.webp?Expires=1787307611&Signature=yAGL~wEsorJNY7iWuGmUhTBzbNbHqOTIJgZf1XJdeIhoB4pPAvLGH0wtoOk5V9D~t6WuZpkL33apK~v1yLEXCJq4Dam~xVHasPiBikB3DfaoNXS5xxCm~FcGvhN~o11rqZEjt~TKDXMB9JjaNJN3j69VJ4LDBaiErtL~8OYH-Ufd76wSmIhDtIjkjnAOOQOZst9FBaqF0qaWUtfvZqZmbzPiLq0bQHEzIr4-BlDP~KA5K2QFz9Sd~Oi0zOYw2Csp4i~6nS9wcpDiXOcTATVoH93udAcdpRy-54YlKPQr824p7EzJ~8bNQbrS8r08bPyaRreLfRyz3A4RBGZ9T4-htQ__&Key-Pair-Id=K2W722D70GJS8W&Expires=1787307611&Signature=kg4ZDeskMLJLZgM~PjBlirhYl~XkQuY9bj8jIQtFZCnowt2loPcYhX2PdLX2RmMDnlXrwYLYhENtfoCu8imgc6yiOCLKDfiubZKH2vAGpMkuVkACj7l1t~SKepGKdzL6OBej-UU1krKLB69mr6XkF6AfHY84JfvyrZK-CQKMcF1F2MK5UlUOgZehNKihdDCYex8XWol7chsH0CDmxQlr3noX1C1h9dy7p8BhfsNBnDBqNtStuVmCdSQKLNTKL9wsnSzxz85~slp~G8VVU0SQFDQtc18BTcKxEEbKxP4ZnufQmrM1seACaDPLFgstRfwXyo28RzXWZarYfleJDxrOCQ__&Key-Pair-Id=K2W722D70GJS8W)
