sin2120°+cos180°+tan45°-cos2(-330°)+sin(-210°)=_.

问题描述:

sin2120°+cos180°+tan45°-cos2(-330°)+sin(-210°)=______.

原式=

3
4
-1+1-
3
4
+
1
2
=
1
2

故答案为:
1
2