sin²1°+sin²2°+sin²3°+...+sin²89°化简

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/30 03:59:24
sin²1°+sin²2°+sin²3°+...+sin²89°化简

sin²1°+sin²2°+sin²3°+...+sin²89°化简
sin²1°+sin²2°+sin²3°+...+sin²89°化简

sin²1°+sin²2°+sin²3°+...+sin²89°化简
原式=sin²1+sin²2+……+sin44²+sin²45+cos²44+……+cos²1
=(sin²1+cos²1)+……+(sin44²+cos²44)+sin²45
=1+1+……+1+(√2/2)²
=89/2