sin²1°+sin²2°+sin²3°…+sin²89°的值是多少

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/29 03:51:54
sin²1°+sin²2°+sin²3°…+sin²89°的值是多少

sin²1°+sin²2°+sin²3°…+sin²89°的值是多少
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