问题
填空题
sin
|
答案
sin
+cos25π 6
+tan(-10π 3
)+sin(-25π 4
)•cos(-7π 3
)=sin13π 6
+cosπ 6
+tan(-4π 3
)+sin(-π 4
)cos(-π 3
)π 6
=sin
-cosπ 6
-tan(π 3
)-sin(π 4
)cos(π 3
)=π 6
-1 2
-1-1 2
×3 2
=-3 2
,7 4
故答案为-
.7 4