数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89°数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89° 求详细解答过程!
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/21 04:28:02
![数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89°数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89° 求详细解答过程!](/uploads/image/z/1988898-42-8.jpg?t=%E6%95%B0%E5%88%97%E6%B1%82%E5%92%8C+sin%26%23178%3B1%C2%B0%2Bsin%26%23178%3B2%C2%B0%2Bsin%26%23178%3B3%C2%B0%2B.%2Bsin%26%23178%3B88%C2%B0%2Bsin%26%23178%3B89%C2%B0%E6%95%B0%E5%88%97%E6%B1%82%E5%92%8C++sin%26%23178%3B1%C2%B0%2Bsin%26%23178%3B2%C2%B0%2Bsin%26%23178%3B3%C2%B0%2B.%2Bsin%26%23178%3B88%C2%B0%2Bsin%26%23178%3B89%C2%B0++++++%E6%B1%82%E8%AF%A6%E7%BB%86%E8%A7%A3%E7%AD%94%E8%BF%87%E7%A8%8B%21)
数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89°数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89° 求详细解答过程!
数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89°
数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89°
求详细解答过程!
数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89°数列求和 sin²1°+sin²2°+sin²3°+.+sin²88°+sin²89° 求详细解答过程!
sin(π/2-x)=cosx
原式=sin^2 1°+……+sin^2 44°+1/2+cos^2 44°+……+cos^2 1°
=44+1/2
=89/2