cos²¼π+sin²四分之十七-sin﹣三分之八π*cos-六分之三十一π-tan¾π+cos(-1260)
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/21 14:39:55
![cos²¼π+sin²四分之十七-sin﹣三分之八π*cos-六分之三十一π-tan¾π+cos(-1260)](/uploads/image/z/210580-52-0.jpg?t=cos%26%23178%3B%26%23188%3B%CF%80%2Bsin%26%23178%3B%E5%9B%9B%E5%88%86%E4%B9%8B%E5%8D%81%E4%B8%83-sin%EF%B9%A3%E4%B8%89%E5%88%86%E4%B9%8B%E5%85%AB%CF%80%2Acos-%E5%85%AD%E5%88%86%E4%B9%8B%E4%B8%89%E5%8D%81%E4%B8%80%CF%80-tan%26%23190%3B%CF%80%2Bcos%28-1260%29)
cos²¼π+sin²四分之十七-sin﹣三分之八π*cos-六分之三十一π-tan¾π+cos(-1260)
cos²¼π+sin²四分之十七-sin﹣三分之八π*cos-六分之三十一π-tan¾π+cos(-1260)
cos²¼π+sin²四分之十七-sin﹣三分之八π*cos-六分之三十一π-tan¾π+cos(-1260)
cos²¼π+sin²四分之十七-sin﹣三分之八π*cos-六分之三十一π-tan¾π+cos(-1260)
=cos3/4π+sin²1/4π+sin2/3π* cos5/6π +tan1/4π+cos180
=-(√2/2)+(√2/2)²+(√3/2)* (-√3/2) +1-1
=-(√2/2)+1/2-3/4
=-(2√2+1)/4