cos150°×cos(-570°)×tan(-330°)/cos(-420°)×sin(-690°)

来源：学生作业帮助网编辑：六六作业网时间：2024/11/16 22:47:51

cos150°×cos(-570°)×tan(-330°)/cos(-420°)×sin(-690°)cos150°×cos(-570°)×tan(-330°)/cos(-420°)×sin(-690

cos150°×cos(-570°)×tan(-330°)/cos(-420°)×sin(-690°)
cos150°×cos(-570°)×tan(-330°)/cos(-420°)×sin(-690°)

cos150°×cos(-570°)×tan(-330°)/cos(-420°)×sin(-690°)
cos150°×cos(-570°)×tan(-330°)/cos(-420°)×sin(-690°)
=-cos30°×cos210°×tan(-30°)/cos60°×sin30°
=-√3/2×（-√3/2）×（-√3/3）/（1/2×1/2）
=3/4×（-√3/3）×4=-√3