sin2120°+cos180°+tan45°-cos2(-330°)+sin(-210°)=_.
问题描述:
sin2120°+cos180°+tan45°-cos2(-330°)+sin(-210°)=______.
答
原式=
-1+1-3 4
+3 4
=1 2
.1 2
故答案为:
1 2