sin²1°+sin²2°+sin²3°…+sin²89°的值是多少

来源：学生作业帮助网编辑：六六作业网时间：2025/01/18 17:05:42

sin²1°+sin²2°+sin²3°…+sin²89°的值是多少sin²1°+sin²2°+sin²3°…+sin²

sin²1°+sin²2°+sin²3°…+sin²89°的值是多少
sin²1°+sin²2°+sin²3°…+sin²89°的值是多少

sin89=cos1,sin89^2+sin1^2=1然后利用起来